44 BOTANICAL GAZETTE [JULY 
Fic. 29.—Shape of embryo at the time it can be seen without a lens; 
diagram. 
Fic. 30—Polyembryony; dia 
Fic. 31.—A freak embryo; a ond embryo (c?) developing on one of the 
first pair of cotyledons (c*); dia; 
Fic, 32.—Diagram of a scab ectina of an wather, showing the four spo- 
rangia. 
Fic. 33.—Pollen mother cells. 
Fic. 34.—Formation of tetrads. 
Fic. 35.—Tetrads 
Fic. 36.—Pollen grain; one nucleus. 
Fic. 37.—Pollen grain; two nuclei. 
