May 1 8, 191 1] 



NATURE 



0/7 



~i liing that "resistant" varieties or "strains" should 

 be grown but in all cases mention the names of such 

 "resistant" varieties obtainable on the market. Such 

 practical information is likely to be of great value to 

 the market grower or gardener; it must be admitted 

 that such assistance as this is not yet able to be given 

 in this country, except in a few cases, by the man of 

 science to the grower. 



Throughout the book we find instances given of 

 fuiii^ou^ diseases of different crops which have become 

 epidemic in various districts in the States and caused 

 serious n\oney losses; on the other hand, we have 

 detailed evidence given showing that such losso^ m.-a 

 often be avoided by careful and thorough spraying 

 with the right fungicide at the right time. The 

 annual Io-.> caused by potato "blight" in the United 

 State- i- <>timated at 36,000,000 dollars; that caused 

 by wheal ■rust," hj. 000, 000 dollars. Turning to hor- 

 licultural rr()|)>, we are told that the violet "leaf- 

 spot" caused, in iqoo, a loss of 200,000 dollars; the 

 celery " leaf-spot " — which for the past three seasons 

 lias Ixin causing havoc in several counties in tliis 

 countr\ i> stated to have caused a loss, in Cali- 

 fornia, in iqoS, (it 11)50 car-loads, and a mono\- io^s 

 of 550,000 dollars. An interesting account is given 

 of the gradual invasion of the .States since 1896 bv 

 the ;t-,]);iraLius "rust"; it is now known in every 

 St.iti' wlii-n- asj;,iragiis is grown — 



■ lii -liir.t- States the invasion of this disease has 

 alnio-i, it not quite, prohibited commercial asparagus 

 L^iMwing. . . . The Palmetto varieties are quite re- 

 si-!an!. and offrr a solution of the rust problem in 



<'w:ii- !i ii'ilit ii--." 



<)! !!i'' Ainciicin gooseberry mildew (wiiich we 

 may renieinlur ha-, since its introduction into Europe, 

 ;il)oii! ri)oo. now spread over the whole of Ireland and 



I'jil;! iikI I it is s.iid : — 



■ Ihi- hsr.is,- lias quite prohibited the cultivation 

 o; i;> 111! r sdiis of English gooseberries in America, 



■ iiiil i- a .L;:.i\f menace to the culture of gooseberries 

 in luiropt-.'" 



Oil,- i,r I 'A 1 1 points of purcl\- scicntitic ini-Ti-st m;i\ 

 !■ '.'■■'■(L 'i'hr siairincnt is macii' that tiv p,'! mildew 

 1/./ ''' '• !vi^(i)ii] hihern.ates in sitcJ derived tVoin 

 :i!;..i''! ;.'.(!-, .and th.al the celerx- " leai-spoi " {S('p- 

 htriit hi-tmsrliiu, v.ar. Apii] is proh.ahlv carried l)\- 

 ihi- seed ot reler\-. The luislake is made of idenlif\- 

 in;4 ihf mildew on iHKaniihi-r, lantah nijn'-,, and musk- 

 mi-loos with /■.'r\'x//'/;e jii'l v^dhi , alihoLigii Reed's in- 

 t're-,iinL; work on ihe specialis.il ioii of [),ar;isitism 

 shown le, ihis mildew whieli ihis nueolo^^i-i c.h-- 

 r'-(tl\ ii-i.-ti'-d to /'.'. ('i( linnifC(inii)! was r.Meinix 

 piihlish. d in the Sl.ates. in pl.ie,- ,>| I'ml. i-, [^Iht.-ni ihe 

 ;:!is!iri!'! l''''i>>sf^h(trriii (with the "popular" (li name 

 <■ ") ap|)ea|-s iliree tinie> ; ,,!„ , ip,. 



!!'■ <'l Spluu-n-llicru ino/' is eonlime'd 



tor liii' appli' mildew, and the nnstake m.ide o|' snp- 

 [)osin- thai r<<ilnsph(irr(i Irn, <>l rii lin of wiiirh .S". 

 )).'!(// i- a s\non\ni is ;i distinct speei.s. 



'\'\u- h, .ok is \er\ well ilhisirated, and \\v wriiin^; 

 rem;nkahi\ ( kai' and to the point. Tliet,' i, .uie 

 touch o| r),-danti\ qnite out ot placi' in such a pr ic- 

 tica! h".!. .Is this ai^.aiiisi whiih .1 -'loa,.^ oioh-,' 

 mus; d ihe .iMinipi : 



.N- '. J i()<S, VOL. 8()| 



names derived from the generic name of the fungus 

 causing the disease. Thus .we have " Sphaeropsose " 

 proposed for "black rot," caused by Sphaeropsis, and 

 such verbal monstrosities as " pseudomonose," " lasio- 

 diplose," "men|liose," &-c. 



A chapter on the legislative regulations — Federal 

 and inter-State — in force in America might have been 

 added to make the admirable thoroughness of this 

 book quite complete. As it is, this book should be in 

 the hands of all the officials — both the Board of Agri- 

 culture's inspectors and the inspectors of the various 

 countv councils — who are now engaged in England 

 in the work of combating fungous diseases under the 

 provisions of the "Destructive Insects and Pests Act." 

 The imj^ortance of the need to create a more en- 

 lightened public opinion on matters connected with 

 plant protection and plant sanitation is rightly in- 

 sisted upon in this book; as its authors say: — "To 

 ireate ,1 much-needed, enlightened, aggressive public 

 opinion is part of the dutv of plant pathologv." 



E.'S. S. 



ELEMENT. \ K Y M AT 1 1 K MA TICS. 

 (i) T Class Book of Trigonometry. By Dr. C. Davi- 

 son. Pp. viii + 200. (I.ondon : Cambridge Univer- 

 sit\ Press, 19 10.) Price V'"- 



(2) TJic Student's Arithmetic. By \V. M. Baker and 

 A. A. Bourne. P.p. viii + 32S+i. (London: G. 

 Bell .and Sons, Ltd.. rqio.) Price 25. 6d. 



(3) First-]', \ii ]Iiillie))i(tliis for Secondary .'^cliools. 

 B\ Prof. (,. W. .Myers rmd others. Third edition. 

 P|). \ii + 3()5. (Chicai.;o, L .S.A. : I'niversity of 

 Chicago Press; London: Cambridge University 

 Priss. ii)o<).) Price 4.V. net. 



(4) .Sccond-Vedr M(itlu-)ti,iliiS for Secitndary ."^ehools. 

 By Prof. (i. W". Mxer- .and others. Pp. xiv + 282. 

 (Chii'.ii^o, l'.S..\. : I iii\ersii\ of Chicago Press; 

 Lomlon ; CanihridL^e I iiixeisiiy Press, 1910.) Price 

 b^'. net. 



(5) (leomelrie K.xerciMS Un' \l'^,hraii Sulutio)!. Scco^id- 

 Venr .M atlir))iali,^ i<n >r,,nul(ny S,iiih>l.s. lU 

 Prof. C W. M\ers .nid others. Second impression. 

 Pp. ix + 71. (Chicago, r.S..\. : Cni\ersitv of 

 Chicai^o Press; London: C.amhridi^e l'ni\ersir\ 

 Press, i()0().) Price 3.^. 0(/. net. 



' 1} ' I "• 1 1 1", introductoiw course pro\idi'd h\ this 0'\ . 

 ■L hook includes th,- sohition ol iii.m^le- 

 omitting llic .tmhieuous case. ajipliiMt ions to ih 

 L;eomeir\ ol the triani^Ie .nid qu.adrilateral, .mil easy 

 jirohlems in sur\e\ in;^. Complicated ideiuities are 

 e\cluiled on the ^:;rouiKl tli.it the\ helom; to the pr.i- 

 _;t:mmie of th<' specialist iMther th.an the amateur 

 lor whos.. Use this is jirimailK intiaided. 'i he i^cnerai 

 cli.n.icier ot thi' hook will proh.ihl\ he ..>n-id.^red 

 niKJuh coiisoi \ ,iii\. . 1 1 fails to l.ike I ■ of 



the reci'iU miwi-nieiii .illecliu,.; the le.icina^ .n iiigo- 

 noineiiA. There is sc.nciK .is much nunieiicd w.>i\, 

 as m.iiu te.ii hers will rei|uiio, .md the qu.diix ^^l the 

 piohjenis. which pictiss lo 1m pi.ictic.d, is di-tinctl\ 

 ao..i-. Ihe hesi je.iiure ot ihi- hook is the materia! 

 o;, aided tor oral work, which will l)e louinl inv.alu ihk- 

 lass purposes. 



