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in such simple form that they couild le readily remem-

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fast approacliing an uttter destruction of our forests, isnowlhere mienitionied."

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sometimes eveni root 'eii ill)." lie added. with a^ll amused

sulile, as if lhe founitd tlle whlole mlatter ratlher a good joke."You see, most folks don't look at it as you (do; twenty-five years ahead is a long time; we shan't feel the pinclmuch before that, and then-well"-thlen, we imieitallycontinue(l, wlleli, like Saml-son, our strength lias beeuislhorn froIm uls, wlhen our Ilills are as barren as those ofPalestine, anid( our rivers can nio longer turnl the factorywlheels, wlien our populationl has doubled, a-nd tile priceof woo(1 sextupled, then our ehlildreli, wvaiting for a hun-dred years, and toiling wvith infiniite cost aild plus to re-

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THE USES OF THE LITTER BY SPARROWS.

lEditor AS'cie,wc: Tile follow,iini ineildent ol)servedl b)ymy step-somi, twelve years old, miiay be of interest inconlection witli tile moote(l question regarding tileuse of tools, utensils and weal)olls by the loweranilyals. (owingl ovIN-gAtRIe SNEtnT,L.

At fewv days a,,o, as I wvas wallkilli- aloii-r tlle street nlear

[Vol. XXII. No. 551

a little park. I saw a sparrow lying uplon the grouind. Itfluttered its winlgs, bIut was unable to rise.As I wvas looking, a pair of oltl )irds camne alog, carry-

ig, l)etween tlheim a little bare t\vig about three incheslolng 0ne llad lol0( of one eu(1 of it, anil its coin-panio1 hadhlold of the other. They brought it (Town tothe bird on the ground, and it caug,ht lhold of the stickwitl its beak.

'Ulien they flew iup) again into a tree, carryin,g the thirdbild hang-in to tlhe stick, and by this means brouglht itto a p)lace of safety.

I am not sure that tie l)ir(l on the grounlld was a yo11gone; it looked (tquite large antd may have been woundled orsick. It was not able to fly, allyway, for I saw it try todo so withotut success. All the birds were commonE-glisls sparrows. E. S'TANLEY S1'RAGUE.Chicago, Ill., Autg. 7, TiS-

SPACE RELATION OF NUMBERS.

Mlt. M\itrIN's association of the natural series of nuiiii-b)ers wxith a diagram in space is l)y i1o menans unusual.As I have a similar association myself I lhave b)een1 inter-ested in tile accounts published from time to time l)yl)eol)le, most of wlhomii inlagine tlheir experiences to 1)eullni(tie. There must by this time be qiiite a literature ofthe subject, tlhough I do liot knlow wlhetlher any one liaskept track of it. I slioul(l say, however, that m1ost per-sons having a strollg sense of locality *oul(d 1)e al)t to as-sociate, not only tile series of iumnb)ers but also any otlierseries, sucil as the montlhs of the Year or the days of tleweek, withl a space diagram. In mi5y owvni case the natuiralnumbers 1)egin at my left hanrd (tuite close to me anid runin a straighlt line diagonally in perspeetive into tlle dis-tance towardis tile riglht. ]Peyond one hlndrled I canscarcely see themi:, hlowever. Tile montlis of tlle year aresimilarly arraugedi save that tlle current miionitlh is alwaysclose to ine. Mlost other series lhave some sort of spacearrangeme t, the kings of England, for instaniee, beeginningiat a (listance, and running, in a very eccentric curved anidzizzag line, finishing near me. I localize almost every-thing I mernorize or thlink of deep)ly.

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