306 LILIAN J. GOULD. 
alveolar layer. Killed osmic, stained picro-carmine and picric turpentine. Zeiss, 
oil imm. 4, comp. oc. 8; tube at 19 mm.; camera. 
Fie. 10.—Protoplasm between vacuoles, to show finest alveolar structure. 
v. Vacuoles. a. Alveoli. 
Fic. 11.—Small portion of section. Killed osmic, stained picro-carmine 
and hematoxylin. Zeiss, oil imm., comp. oc. 8. 2. Nucleus. v. Vacuoles. 
v,v. Vesicles corresponding to the chlorophyllogenous vesicles of P. viridis. 
Fic. 12.—Bacteria. Zeiss, oil imm. 3, comp. oc. 4; tube not drawn out. 
