u ADVERTISEMENTS. 
AN IMPORTANT WORK. 
The Primary Factors of Organic Evolution. 
y E. D. COPE, 
ILLUSTRATIONS, 121. PAGES, 550. TABLES, BIBLIOGRAPHY AND INDEX. CLOTH, NET $2.00. 
MAIN CONTENTS. 
VARIATION. CATAGENESIS. NAT aie a 
PHYLOGENY. PHYSIOGENESIS. HEREDIT 
PARALLELISM. KINETOGENESIS. THE OPIN ion: S ‘OF NEO-LAMARCKIANS. 
PRESS COMMENDATIONS. 
Will stand as the most concise and complete exposition of the doctrines of the Neo-Lamarckian 
se n ok published. A valuable text-book for teachers and students.”’—Prof. H. C. Williams, in 
Science N 5 
“A work of unusual originality. No one can read the book without admiring the intimate oe 
of facts and the great paw ers of generalization it discloses.’’—Prof, J. McKeen Cattell, in Mature, London 
“Adm irab 7 suited for class-room or library.” —Boston Yournal. 
“ Gathers up and presents in a “bacco form a vast amount of information.’’—Boston Morning Herald, 
‘A clear, straightforward statement of the most important *uliiance ppo which the doctrine of 
evolution in the organ orld rests. N ot an expository textbook of an elementary character, but hoe k 
nected argument by a aoc in his field for the value of this evidence and the truth of evolution 
it i rily i c 
ma 
which the writer ga nich thee devot ted h be This is at once the most a eh and ast developed 
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