th i i) i eh et i) LO 
DYNAMIC EVOLUTION 
By CASPER L. REDFIELD 
Price $1.50 
DYNAMIC EVOLUTION shows that the energy in 
animals, known as intelligence and physical strength, is 
identical with the energy known in mechanics, and 
is governed by the same laws. 
$1,000 
Have been deposited with the AMERICAN GENETIC ASSOCIA- 
TION to be paid out at their discretion if it can be shown that 
those laws are ever violated in the reproductive process. DY- 
NAMIC EVOLUTION is authority for the meaning of the terms 
of the offer, the details of which were published in the JOURNAL 
OF HEREDITY for February, 1916. 
G. P. PUTNAM’S SONS 
NEW YORK and LONDON 
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9 oh me 0 me 0 me me Bh me 0 mh ee fh ee ee ee 
$s 8 By 1h I 1 fh ee HH 
EUGENIO RIGNANO 
UPON THE 
Inheritance of Acquired Characters 
A Hypothesis of Heredity, Development, and Assimilation 
Authorized English Translation by Basil C. H. Harvey 
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| ‘Some deny flatly the possibility of ever arriving at an understanding of the nature of | 
| life. But if we ask ourselves in what this understanding of the nature of life could consist, | 
j from the point of view of positive philosophy, we have no difficulty in recognizing that such ] 
: an understanding must be reduced to’comparing vital phenomena with some physico- 5 
| chemical model already known, suitably modified by the particular special conditions | 
j imposed upon it so that just these special conditions shall determine the differences which j 
: exist between this vital phenomenon and that phenomenon of the inorganic world most § 
| closely related to it. If this be so, it is then the duty of science emphatically to refuse to | 
j give up the attempt to understand the nature of living matter, for that would be to belie | 
: the Spirit of all scientific endeavor. For whether it be clearly recognized or not, it is just j 
| this search for the nature of the vital principle which properly constitutes the principal | 
j object and the final goal of all biologic study in general.’"—E. Rignano, in “Acquired | 
: Characters,” p. 334. 5 
| Price $3.00. Cloth, pp. 400 | 
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THE OPEN COURT PUBLISHING COMPANY 
122 South Michigan Avenue 
Chicago, Ill. 
