46 Menders Experiments 



3. To the difference in the colour of the seed-coat. 

 This is either white, with which character white flowers 

 are constantly correlated ; or it is grey, grey-brown, leather- 

 brown, with or without violet spotting, in which case the 

 colour of the standards is violet, that of the wings purple, 

 and the stem in the axils of the leaves is of a reddish tint. 

 The grey seed-coats become dark brown in boiling water. 



4. To the difference in the form of the ripe pods. These 

 are either simply inflated, never contracted in places ; or 

 they are deeply constricted between the seeds and more or 

 less wrinkled (P. saccharatum). 



5. To the difference in the colour of the unripe pods. 

 They are either light to dark green, or vividly yellow, in 

 which colouring the stalks, leaf-veins, and calyx par- 

 ticipate*. 



6. To the difference in the position of the flowers. 

 They are either axial, that is, distributed along the main 

 stem ; or they are terminal, that is, bunched at the top of 

 the stem and arranged almost in a false umbel ; in this 

 case the upper part of the stem is more or less widened in 

 section (P. umbellatuni)^ . 



1. To the difference in the length of the stem. The 

 length of the stemj is very various in some forms; it is, 



* One species possesses a beautifully brownish-red coloured pod, 

 which when ripening turns to violet and blue. Trials with this 

 character were only begun last year. [Of these further experiments 

 it seems no account was published. Correns has since worked with 

 such a variety.] 



t [This is often called the Mummy Pea. It shows slight fasciation. 

 The form I know has white standard and salmon-red wings.] 



[In my account of these experiments (R.H.S. Journal, vol. xxv. 

 p. 54) I misunderstood this paragraph and took "axis" to mean the 

 floral axis, instead of the main axis of the plant. The unit of 

 measurement, being indicated in the original by a dash ('), I care- 



