ERRATA. 
Page 13.—Paragraph 1. Insert the before science, the last word of 
the paragraph. 
Page 13.—Paragraph 3, line 3. Change complimentary to comple= 
mentary. 
Page 14.—Paragraph 2, line 2. Directive instead of direct. 
Page 15.—Paragraph 1. Enjoy for enjoyed. 
Page 15.—Paragraph 2. Heliotropism for Heliotropisms. 
Page 16.—Paragraph 3, line 8. Larva for Larvae. 
Page 64.—Line 4. Omit entire line. 
Page 71.—C. Artificial Parthenogenesis. 
Paragraph 1. Sentence three should read as fol¬ 
lows : 
“Loeb, in 1S99, succeeded in developing plutei 
from the unfertilized eggs of the sea urchin, when 
the, etc.,— 
Page 75 -—Paragraph 5. Sentence two should read as follows: 
“In species producing by this method, the ferti¬ 
lized eggs always develop into females, while 
males develop through parthenogenesis, etc.,— 
107 
