SEED-COLORATION 373 



their hue after the fruit opens ; whilst in leguminous pods the 

 seed colouring is practically complete when dehiscence takes 

 place. With Leguminosae this is the general rule whether the 

 pod regularly dehisces, or breaks up into joints, or liberates 

 the seeds by its decay. As further illustrations may be 

 mentioned Abrus precatorius. Acacia Parnesiana, Adenanthera 

 pavonina, Canavalia gladiata^ and C. obtusifolia^ Dioclea reflexa, 

 Entada, Erythrina, Guilandina, Leuc<ena, Mucuna, Phaseolus, 

 Poinciana regia, Vicia^ Vigna luteola, etc. 



With regard to the question whether seed-coloration is Does seed 

 confined to one or all of the three states of the fruit, the green, ^wI^wL 



* O * tciKc pia.ce in 



the ripe, and the drying, there are so many different determin- ^ reen 



,. . r j i ' r , n P e or dry- 



ing conditions between one rruit and another that a careful ing fruit? 



investigation is requisite before one can venture to reply. 

 One would infer after watching the seeds of Vida darkening 

 in the drying and blackening pod, or the Horse-chestnut seeds 

 as they brown in the drying capsule, that drying is necessary 

 for their colouring. Here we should undoubtedly be wrong. 

 On the other hand, we would conclude after observing the 

 process of seed-colouring in the Blue-bell (Scilla nutans} that 

 the seeds acquire their shining black hue in the moist green 

 capsule. Here we should most probably be right. That the 

 coloration of the seeds does frequently take place in the closed 

 capsule whilst it is still green and moist has indeed been clearly 

 shown a page or two back. But the subject is very complicated, 

 and Nature seems to have done her best to make observation 

 difficult and immediate inferences hazardous, more especially 

 with legumes. Here experiment and observation must go 

 hand in hand. 



In the first place, I will take the colouring regime of the Experi- 

 seeds of Scilla nutans as disclosed by my experiments on the LJbimenko 



fruits of the living plant. When I experimented on these 

 capsules in the summer of 1908, I was not aware that similar interior of 

 experiments had been made by Lubimenko on the pods of 

 certain leguminous plants, Pisum sativum, Colutea arborescent, and 

 Lathyrus latifolius, the results of which have since been published 



