154 
NATURE NOTES 
Fig. 138. 
1. Potato seed germinating. 
2. Section through the same, showing position 
of cotyledons and endosperm (shaded). 
3. Seedling nearly free from seed-coat. 
4. Seedling quite free (10 days' old); a hypo- 
cotyl ; b root ; c cotyledons. 
Fig. 139. 
Potato seedling (16 
days old), laterstageof 4, 
in previous Fig,, showing 
plumule e. The coty- 
ledons c have become 
broader ; a hypocoiyl ; 
b root. (Natural size.) 
Fig, 140. 
Potato seedling (26 d.ays' old), later stage 
of Fig. 139. The Plumule e has developed 
considerably, and in the axils of the coty- 
ledons two shoots ti have been produced. 
n hypocotyl ; b root; c cotyledons; e 
cpicotyl ; jc ground*. ine (Natural size). 
Fig. X41. 
Potato seedling (10 weeks* old). Liter 
stage of Fig. 140. The shoots a have 
now pushed their way below ground and 
at their tips small tubers have formed. 
(Natural size ) 
