634 
Kershaw— Structure and Development of the 
Text-fig. 13. Longitudinal section of an ovule (diagrammatic). 0. — outer fleshy layer 01 
integument ; s. — stone layer ; i. = inner flesh ; n. = nucellus ; i.b. = inner series of vascular bundles ; 
o.b. = outer series; m.s. = sclerenchyma round micropyle ; up.c. = upper^ pollen-chamber; lp»c. = 
lower pollen-chamber ; p.t. = pollen-tube. 
