Chap. I. 



LATHYRUS. 



83 



during 38 h. (Fig. 23). We here again have plain evidence of 

 continued circunmutation. Had the bean been properly planted, 

 the part of the epicotyl to which the filament was attached, the 



Fig. 23. 



Vich faba : circumnutation of the same epicotyl as in Fig. 22, a little more 

 advanced in age, traced under similar conditions as before, from 8.40 a.m. 

 Dec. 28th, to 10.50 A.M. 30th. Movement of bead here magnified 

 20 times. 



movement of which is here shown, would probably have just 

 risen above the surface of the gi'ound. 



Lathyrus nissolia (Leguminosse). — This plant was selected for 

 observation from being an abnormal form with grass-like leaves. 



Fig. 24. 



Lathyrus nissolia: circumnutation of stem of young seedling, traced in 

 darkness on a horizontal glass, from 6.45 a.m. Not. 22nd, to 7 a.m. 

 23rd. Movement of end of leaf magnified about 12 times, here re- 

 duced to one-half of original scale. 



The cotyledons are hvpogean, and the epicotyl breaks through 

 the ground in an arched form. The movements of a stem, 1'2 

 inch in height, consisting of three internodes, the lower one 

 almost wholly subterranean, and the upper one bearing a short, 



