122 



Heredity and Eugenics 



protected with absorbent cotton plugs, is a better device. 

 It gives excellent protection and allows transpiration. 



But I must pass from the technique of hybridizing to 



Fig. 51. — Impatiens sitllaui showing protection of castrated buds in green- 



house. 



the results. They are much more interesting. As has 

 already been stated, desirable horticultural novelties are 

 obtained most frequently by crossing two plants which 



