sitizlng \ Radio" "

_-R|sg of American Qhemistry. -Eiectrlc Light Fish-feeding.- A Bounty Food filament. - An impending Desert. — Our Eleo- trlcity. <

Three distinct types oi tarnish- ing in metals have -been recognized in the study canted out ior the British Non-Ferrous Metals Re search Association. ‘This discovery, Metal industry thinks, may prove oi‘ great importance, both ire-m a practical point oi view and irom its hearing on the problem oi cor- rusion. Copper represents the tilrsl type. and in this the tarnishing process gradually slows down, the tarnish till-m seeming to he continu- ous and impermeable to the air. thus giving protection to the un- derlylng metal. Zinc in a dry at- mosphere gives an illust ation oi the second tyne. in which the ‘on duilon steadily cont-lauds, the, {gr- nisll tllm appearing to palimit the "if l0 Pa?! ireeiy. "In the third type, “xemplmed 53'1"". "l9 Qilrrosion.

"tart-ills slowly. they become acne] "

erated, and‘ the ' roce i . assisted ‘by’- i-he L» $1M? 753$ metals as brass and zinc; may loi- low more than" one type or pfo grem- "Wm! with atmospheric conditions olnwith the thickness oi the tarnish illtm. lln brass, ior in stance. "the attack proceeds uni. mm]? if liﬂnthen slows down as the protective inﬂuence oi the ﬂlm develops.‘ l “Cimient WOIIGQ," the 119w water. mlwrv ous cement, is ground {mm {ﬁlly M?“ “lull”. 116111! darker an other cements. A recent esti- mate fives lb cost at w‘. and a h t mes that oi iPm-ﬂ-agm cement t ough a smaller _quant.ity is usual- ly required. Hardening to iuii strength in, t-hfee days. it is es- Pedﬂlly valusbe in road repairing and ior urgently needed buildings. “d l‘ l! vwﬂstwted Billi-‘ﬂble 1dr ‘ill "Ell", laboratory testsiindi. B-ite twicepthe strength oi Portland cement; _ _ _

Altiiloiui crystals oi’- galena (lead “ulillliilélrmrs much more sepsitive “d” 4.1939“??? ..lh_8il tho natural crystals." ‘Ito produce the‘ Nﬁflq tullizatioh.‘ _'l‘ll0 Wireless World Bilsliootwplacing the broken- up Usi- "l". iiovered with a little sulphur, in a crucible, luting-on the cover, and heating (or hali an hour above the IIIIIIIQ.1.Q'IIEQPII\IIQ oi 1,120 d9!- C. Very slow cooling oi the crucible than causes the formation oi the sensitive crystals.

Elralkh oysters hvae been the Bu-bioct oi recent investigations, especially with reierence to the uil- usual mortalityin the beds during 1920-21. ‘Seasonal variations were round to include an increase oi weight in autumn or early winter, evidently due chieﬂy to: gain in Kiyoogen, or snlmarstarch. and this m the period oi greatest nutri.

' “ "“"§<h »»~.»-.

um iuﬁhei-shecqnd halt oi the year. The normal "oysters locally grown, . _ r ligQll l; higher-proportion in relaid _ _‘_ , ,_ _ I , Noysterg’, and the loss-assignable to Mysterious Epidﬂltlﬂ "III 0W1!“

THE "CHARLQTPETOWN GUARDIAN PAGE SEVEN

give value." "Proteins thew a mas-i mum in‘ the spring, with a minim-

oneppeclal cause—ie chieﬂy in the summer. in the eiiort to explain the epidemic, which ioliowed un- usually high dseth rattes in Italy and France. a study was made oi physical conditions, oyster pests. parasites, "dliierences between sound and weak oysters, and pos- sible poisoning irom munitions dum-ped into the water. No mater- ial increase oi moroality could he traced -to any oi these causes. The son's avl-latiqns oi temperature and salinity have some inﬂuence, and

but parasites are normally absent. and the possible harm from dumpt ed 1‘ N '1‘ seems to be negligible. Knew discovery recommended tor iurther investigation was the oc- currence oi microscopic spindles in the muscles-a possible marli o! degeneration irom bruises or starving. The normal accumula- tion oi" traces oi copper, zinc, tin. etc. is harmless. and even in water highly cltsrgetiwith arsenic. the oyster does not ‘absorb an lnjuri ous amount oi’ poison."

More than halt oi the manuiact. uresoi the United States, with a ;0tal value oi more than $82,000,- )00,000 are de ndent upon chem- istry, accordin to Dr. J. E. Teetple, oi the American Chemical Society. Fextilee. iron and steel, leather; paperii ceramics and glass. and metals and metal products are six groups, with a production exceed- ing "$33,000,000.000, having a dis- tinctly chemical basie. The Vail-lb li chemical products in the coun- .ry ‘bras increased irorn $750,000,000 in 1899 to more than $6.000,000,000 .n 1924. _

The electric light over the water in tlsh hatcheries is found to serve the double punposeoi ieeding the ilshes and destroying great num- bers oi troublesome insects. in many places the light attracts vast swarms 0i tiny ﬂying creatures. and these are greedily seized by the hungry ﬁshes as they come near the water surname.

Goltre is characterized by eu- is._ement oi the thyroid gland. but the researches oi recent yeans in- dicate that it is a deﬁciency dia- ease. due to lack oi the minute por. J lion oi. iodine the body requires. i-t proves to be very prevalent in some localities. in 1919 about 12.- 000 persons were shown to be a!- "iected i): WeetVliUinis, and in 1021 the War Department reported inim 15 to 27 cases per 1.000 oi the men draited from the State o! Washing ton ior the war, while the disease is usually about six times as com- mon among ielnsles as among males. investigation is still bola; tirade int-o the source oi the iodine ot diilerent communities amen! ioods and drinks. Places near the sea may be relatively immune iron: the disease, and this is attributed to the salt sea-breezes, icr see- v. eeds and ocean salt bavethe best known stores oi iodine. Goltre "usually yields to treatment. can. sisting in the use oi the lackin! iood element. Plans for prevention include the restoration oi iodine to table salt. ior over-rgﬂuihil 0i natural salt is blamed ior much oi the deilclency in the diet. Some cities pro so to ensure a suﬂlci- ency oi iodine through the water su,,,‘,. lln Rochester. N:Y., the water is treated three weeks in ev- ery six months, and this is thaushi to provide against any harm-fl" shor-tase.

. An important part. oi "South Afri- . ca seems to he threatened with de- siccatioiLllke that oi so much o! Central Asia. use "Naomi. when discovered by Livingstone in 1844. was a body oi water oi consider- athle size, but latter travelers have reported only grass land on its site, the volume oi water even ill ilood time bolas’ only a small its" oi that oi the iornlor lake. The discoverer himseii is said to have foreseen the dryiit u» o! aorthwl ‘Bechuansland. To avoid disaster. q, costly dsmming i0 certain rivers l. pmamq; is m] again Ngalni and - and other dried-up lakes, and it is ‘ ptgd out. that the pdlinit atmos- . n thﬁl/Qtﬂl!“ would sroatiy

lidrease rainiieli and 91'3"“ ‘ |f‘Q'1rQl,Qf country. irom hocom- ' ‘desert. " ‘W’ " -

viiiioria. ll, "W: iltll. m ia also, and m in

u¢~n

predatory enemies claim some "toll. _

'A SPAUNTDN IMPROVEMENT The semi-trimming process was de veloped and perfected in the factory of Siauntons Limited, an industry which has been making wsllpa er since 1856. The Stsunion line gas always led the ﬁeld in improve~ meats. In fact it is unsurpassed by the wallpapers of any country in the world. The Siaunmn Line of Wallpapers for 19234 ls the lust word in beau: of designs and color- ing. his pc eairl ﬁnish.

A good name keeps its lustre in the dark. _

Paperin now costs less

yi/

Cheapest. in the end

- It is only too easy to buy "cheap" fence that will stand up only part of ‘ the time that a ‘Frost Fence would. ~ p

libs ttpuble'isryijt_t,gsy.ao;lsueh {or this "cheap" fence as you would for

OU know that time means money in paper-hanging - thst time, in fact,‘ is the most expensive part of the job.

But do you know that: the cost of papering has now been considerably reduced by the production of Staunton Scmi-_ Trimmed Wallpaper-that this new, paper simplifies the job throughout.

It eliminates all trimming! Its selvage is cut in course of manufacture. All you have to do is rap theends of the roll" on table or ﬂoor and the salvage falls of. You can realize what a big saving in time that means.

But Staunuon Semi-Trimmed Wallpaper is also quicker to hang. Bring perfectly trimmed, it is easily matched. Being ZZ inches in width, it takes less rolls of this paper to covet‘. your walls and consequently less time to hang. “Semi-

_ Trimmed" saves you money —— it saves all the muss and disorder too.

Ask your dealer to show you the patterns.

STAUNTON SEMI-TRIMMEDT_ WALLPAPER

Saves

MANUFACRJRED EXCLUSIVELY BY STAUNTONS LIMITED, TORONTO 5

A large “charity is the growth 0t Health ls the soul that animated yeaa-s, the last result oi many all the enioymellts oi llie., tria s.

You would have to renew it sooner and pay more for erecting. '

Frost Ring-Lock Fence will outlast in other because we make every inch of wire in our own facto ; it is No. 91>; vahized to eliminate rust; its ved laterals take up strains that. would penrlenently sag an ordinary wire fence; above all, it is drawn, annealed and toughened especially for fence.

The sing-lock holds fast; the fence unwinds easily from the roll and goes up on the posts straight and even, ensuring a minimum of time and expense for erection. When Frost Ring-Lock Fence will cost least to erect»

{rad IIIllIltllll-ﬁﬁlld costs no more to bu —why not enjoy the satisfaction it .

gauge wire extra heavily gal-I t

[ways giycs. Sold in 20, 30 or 40 ro rolls-heavy and medium weights.

...,_... .. . _... _

Geffrices from the nearest Frost dealer, or write us direct. " " R I N G Frost Log. Fence

s“... Steel and Wire C0,, Limited, Hamiltorl, cmda

Db:

»." ,