48 



PLANT BREEDING. 



At the end of three j^ears the data recorded in the yearly history 

 sheets are collected and averaged for each stock, using the following 

 form : 



(Minn. Form 6.5.) 



SUMMARY SHEET— CENTGENER NOTES. 



Wheat: Nurserv stock No. 



Size of card, .5^ by S^ inches: color of card, pink. 



Then the averages for the various stocks — the progeny of the single 

 mother i^lants, respectively — are compared by collecting them on such 

 a blank as the following : 



(Minn. Form 67.) 



GRAND SUMMARY— CENTGENER NOTES. 



Wheat. 



Size of card, 5i by 8+ inches; color of card, blue. 



Thus the breeding ability— centgener power— of the various mother 

 plants is tested and compared as to yield, grade (upon inspection), 

 and percentage of nitrogenous content of the grain, and as to ability 

 of the plant to stand- erect, resist rust, etc. 



The records of hybrid nursery stocks are in like manner kept on 

 these cards. On the uppermost card are placed the facts concerning 

 the two parent varieties and the objects sought in the cross. On the 

 second card may be recorded the facts about each individual plant 

 produced the second year by cross-pollinating a certain wheat spike. 

 After having been grown for a few years to allow of free variation the 

 hybrid stocks are dealt with year by year much as in the case of selected 



