Show SECRETS OF SCIENCE COMFORT AND ALARM Z Prof Professor n t ln of or the Royal Ro t Geographical society Ocl hn has estimated d the Ow fertile lands land of the globo amount mO to 10 nt Iw twenty eight million square s the steppes Jo to fourteen millions i r I tool the d deserts to o op ope e million fixing two hundred hUl t rat and seven C persons per Im er- er sons Fons to the square mile for or fertile r t ten n for steppes telI s. s and one for fOl c dob- dob lef erts as us the greatest population that r the the- earth could properly nourish the pr professor re cor arrives cs at al the rho conclusion that when the number of inhabitants nt about six Ix thousand tl million earth Jh nH t will Ib ibe be JH peopled to Its full r I. I la capacity ap lt At present nt U Il contains sonie- sonie r r chat more than one quarter o of that f number dumber 11 i If the tho rate pf pC increase e shown n t by hy the jle latest census statistics t Qu I h be J maintained Professor R lits v- v I- I r ns t e l ln n shows R that the globe Joh f be toll fully peopled bout th tho year cal 11 2072 j tf 1 Wonders of a 11 n ch 1 J 1 11 A watch wate 1 1 is 11 t the 1 le smallest mal I. I est m most st dell dell- 1 e I I cate machine that wa wn was ever o constructed construct construct- 7 z ed d of the same number of or parts About Ahola hundred ne hundred and seventy live different I pieces s of mat material enter into Its con conon con con- on and md I of foul twenty separate OpE operations at ate arc com com- cd in its iLo manufacture When con considered in the aggregate I atc t t Come ome of the facts connected with H its I performances p appear Incredible A rs no strikes several thou thousand nd r n s on his anvil 11 in a day but the ther Droller jewel jevel of a watch makes e cr every everyday relay Ila day and t day tY h Y after aCler da day C four hundred d a two thirty wo thousand Impacts Z 5 against the fort fork forI i i v Ho over the marvel d does s not stop here It H t has been heen estimated d that the lower that moves motes the watch is equit equi- equi aJ t tl to only four foul times limes the force fOlce ili t used In iu a fleas flea's jump consequently it 1 f might be called a n. four flea power Onet One Onet f t would suffice to run Iun two t l r hundred and sc seventy nty million watches j The The balance wheel bt bC a R watch Is 1 mo tl b by this tills four Ilea power ohe oile and antI fort forty three one ore hundredths Inches JJ with each vibration three vibration three thOU thousand live Ac hundred d and lift nine fifty nine t miles continuously cons con con- s t. t in fn one ont year In conclusion Jr lr may be added ade 1 that It H does not nol take tale a large I I e can of oil ell to r lubricate the little machine on Its thirty five hundred mile run tun One One- tenth of a n drop of ot oil Is sufficient su t to oil H the watch h for COl a year Rut nut it hn has great Brent need of or that tenth ore drop hop Z 1 Coll Colored I s for fm Plants One ne of oC late latest t devices proposed t bj by hr an expert of vibe Department t o of r Agriculture e far forTin proving the r of ot plants plant and fruits Is Js that of oC placing th them m under d gln s. s the Idea bein be- be f r in trig tIJa that than JI light i ht r of ot or particular hu hues s. s is n J- J Jl l' l 1 Specially favorable Ca to 10 vegetation The J e. e expert ref referred hl to has recently c experimented perl- perl t oi with strawberry plants grown it ff In hothouses Binder under glass of or different st fr xa coo lH c conclusions n hl hns are Interest rest rest- r i r J f ing g r. r I Orange colored glass II he says nys caust caused caus caus- Ji t ed the plants to grow row more i vigorously vigorous vigorous- orous- orous 11 ly Iy i but at the thc expense of or the berries berries i which were both smaller and later Ja In j t development nt l tt than when the time plants wie w e grown under ordinary conditions Z I Under violet colored calMed glass gins lH the pIn plants d a great gnat quantity of nf lap Inn Ill It was slow slot In ripening small and amI of tf inferior quality Red Ped blue hIll find and gl green greenglass N can n glass Ia all nil m proved nto injurious to th the growth th of oC the plants The finest berries and anti those which ripened earliest weir grown rown Under plain white while glass Jn 1 It would 11 n appear 1 then from rom the these c experiments that light of or different colon colors col col- ors on does have different effect tr ct Upon vegetation as 00 has lias been claimed ed but that as f far 1 n as strawberries Itra b h 1 are arc concerned eon con CrIed ll all the tho colors that poss pos's s. gg 55 5 tt when hen united In r daylight ht are more effective in fn the pi pr duclion 0 of good fruit than an any single color Of cour course c it Is not thc the color itself but 11 the tle character of the thc which gives s1 dial t cAlor that produces the tho ei- ei 1 re EI Every vet l' l color oC of the corresponds cor COf- r responds to light t pOi possessing e inS inS' a a. a particular lar rapidity of or vibration gild and a par par- t pai-t wave wn length in ht the ether Colore Col- Col ore ored glass cuts off some onre i useful cC l ray rao ri J h by f absorbing Jl them hon llou to 10 Make hutch Dutch Tear Tear- 1 tat 11 It 11 is 18 a a. great wonder OI el to rite me said nid nn n ol old ch chemist why h more more boys bon di du not not take up chemical eXI experiments as asan asan an nn amusement Why hy hy 1 I can do things with the tile common of or every even everyday Pl do day life which 1 really leally 1111 seem eem to be mote more magical to 10 the uninitiated than any of the wonders that Huh 01 are ordinarily performed per pr performed form formed by hy ma magicians on the public stage Some o of them are so simple 1 that h by carrying ln them out nut at a parlor entertainment a n a bright boy could Z achieve the reputation rel of or a a. mn magician Now there are arC those curious little bubbles of glass glais known vai variously as Prince drops drops' and as Dutch tears tear Apparently the they are ale merI merely little lit lit- lit little tle tie globules of or glass with elongated clong tails made made-by by hy heating a small glass I rod in allum and allowing allowing- th the molten drops to fall full into water After they fooled cooled ou the thick have you mu nay may pound part with a hammer or mallet yet N Nou you ou can cannot not break them On the other other oth oth- er r ha hand hd If U you break bral a n little piece of or their tails nils or nr touch nn any part pan of ot them then with u a quartz crystal the they will disappear disappear pear Into lute the surrounding atmo atmosphere quicker than snow will melt on u a hot fire To In the the- person who does doCs not know how tins this has happened the lime performance perform perform- ance it is so sn hint hint- hintos as os to seem un un- cann canny Z And yet it it- itI I is all allery very ery simple ItIs It Its Itis Is s due due to to what Is Js known as us surface eo- eo 0 lJ jesion hesion sion Gln s when heated 11 to a molten molt molt- en Ill state has hns reached a er very JY ugh high temperature and when the drops of melted glass S Ia-S fire are allowed ll to fall Into the he cold water the sudden change pro PlO luces 1 uces a stress all aH over oel th the surface of the he drop which Is really f t terrific It i i is exactly as though a pl piece ce of very BY thin ruttier rubber was stretched over 1 th the surface ef of th the gla In If It you ou punctured th the rubber 1 its haste hast to resume its normal condition would pull pun It off of th the glass So when you ou break oft off the tall of the drop or oar cut through the film of cr very hard glass with a crystal Its endeavor or a suddenly sud sud- FoU suddenly d denly nh to tn resume Il Its normal condition i results sulk in its Us own destruction and it breaks up un Into particles part which are really nally finer r than the finest sand Z |