PLANT BREEDING 



345 



Fig. 1. Castration of Buds of Nicotiana tabacum before Crossing, a, correct 

 stage for castration ; b, method of slitting the corolla ; c, castrated bud. 



The theory supposes that when a dominant and a recessive char- 

 acter meet in a cross, the germ cells which are produced in the hybrid 

 do not blend these characters, but possess either the one or the other; 

 and as the possession of either character is a matter of chance, on the 

 average 50 per cent, will bear the dominant and 50 per cent, will bear 

 the recessive character. In a plant, for example, 50 per cent, of the 

 pollen cells would bear the dominant and the other 50 per cent, would 



Fig. 2. Castrated Bud of Impalicns sultani showing Method of Protection in 



Greenhouse Work. 



vol. lxxvii. — 24. 



