426 



GENETICS IN RELATION TO AGRICULTURE 



handling of thousands of cultures each year (in 1912 there were over 9500 

 numbers in the trial plots) has required the devising of many practical 

 arrangements to insure exactness and order. Each distinct strain that 

 has been retained for more extensive trials is regarded as an established 

 variety. Hybridization of cereals had been started at Svalof upon rather 



i-it Relative development at 



fiaseohrs Tdttfts. r, fauto. r.acdam. Vbja tesqirfredifls. Tldafabi. Pole. osh. but, pin shelled, field, food eoedfimi rut 



BiTl 



Seed planted replanted plaits up Pods Olfer maps past use .naps he peej shelled past use thellej ripe Ibtes taken 



Seedrlated 



ruiir^ 



(rat resistant) Stems 



erect spreadUi nprododlve unhealthy > lew many short loot stont slender. Take pole well litU dart yellow reel 



Leaves Flowers 



smalllarp UJ. thick smtettro.lt Hlht dark TeHrwbh freen red purple. tnuHI.rre.wHU larht dark yellow red purple. Stntje. In pairs 



Fruftlni habtt 

 I smaD larn dustm well afcove, half hidden Irr folaH- fodsiel poorly Ireelr , thronrh early lilt short hot stMon miOr slnde 





r ctnlti oaliliU d plul 



(lU, burin, b 

 rtwt tlnto. Vralrtl iatmt 



roncave near tten ctater point 



CmimtlM 

 i near stea ctntcr point flat oral rand b 



liortlom ttJct Aadet ilrlttl turrri lonrri bct.ris 



HHItmacmmd> litit l*A brittl JgH wtltt nJow rtn 



littlt aaet mitkri irllh ? 



Sttam wilhotpoJ 



bdtotod Brttofarto. ttliittfct flohydry trttttt tout imk naclt Bb in Ota mct Uttl. DO ilriai I. Uct ta y 



loaf *ble loon put t 



l ttricp. U4t ind Tilr 



WDS AS CREEK 

 slxrt km 



slender thick straklttsgTlO 





IOOK croTJri la pod 



Mtraoitnllix 



Beu 

 few maT oUris MMl lilii 



CnaihclMbeuiaoktd 



DRY BEAKS 

 l tHncUn color. Thrun not 



Slupc (loot xdta) 



turbtri. 



ItUrr tlttpeJ. fan it ere. Eixli remi Innate 



IMa ttJck (Ul ovl r 



tlctl lUrk re) ytlloT brow. ^ colatJ 



t modi rral Jottoi lMpJ aomri wtft? 



Bot. ipec. takes W. 



Saggtstions for use of signs. Words ir to be erased 1 , 

 tiros* TOrds, and rtfmncts to notes vrrttcn lo so as to leave 

 as foD desoiptloii of stock as possible. Use + to sfcniftr a 

 Uct and - a l<nr dmlopment of quality: A slrnlHes vari- 

 able: U. uniform. A cooitctinj loop between tiro words 

 ilfntfles that stock b Intermediate or varUble between the 

 connected words with more or less tendency toward tie 401]- 

 HT Indicated br the shorter arm ol the loop. A circle fados- 

 Incasttiislr^ilaaieicepUmalorpheiionieiuldetree. A 

 Ur|t circle orer a ituUtv sisnilks that no record has been 

 made of that quality. When space b not sufficient foe 

 desired record, as in cases where ? b Inserted, refer by letter 

 to notes. 



Fio. 173. Variety description blank for beans used by the Bureau of Plant Industry, 

 U. S. Department of Agriculture. (Other face shown in Fig. 174.) 



an extensive scale previous to 1900 but it had not given encouraging 

 results. After the announcement of Mendel's discovery this phase of 

 the work was greatly enlarged, particularly with wheat and oats by 

 Nilsson-Ehle. Through the application of Medelian principles new varie- 

 ties of these cereals have been produced which combine general good 

 qualities with cold-resistance or earliness which makes them better 



