266 



[Vol. 2 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Three hours later but little of the color could be found 



of the 



Next, five ovaries of Oenothera 3.21 



—OK* 



Fig. 3. Diagram of flower of Scrophularia, showing mechanical features of 

 ovarial treatment: s, sepals; c, corolla; g, nectar gland; p, placenta; st, style; 

 ov, ovule; rec, receptacle; p, tip of hollow needle thrust through the ovarial wall 

 and penetrating the placenta. The stippling shows the diffusion of a solution of 

 methylene blue introduced by the needle. — Drawn by F. E. Lloyd. 



(a stable cruciate hybrid) were injected with a solution of one 



