Bauhaus-Universität Weimar

CHAP. XII.] 
SUMMARY. 
193 
the processes of heredity. By their aid, the desired 
equation was thrown into an exceedingly simple form 
of approximative accuracy, and it became easy to 
compare both it and its consequences with the varied 
results of observation, and thence to deduce numerical 
results. 
A brief account of the chief hereditary processes 
occupies the first part of the book. It was inserted 
principally in order to show that a reasonable a priori 
probability existed, of the law of Frequency of Error 
being found to apply to them. It was not necessary for 
that purpose to embarrass ourselves with any details 
of theories of heredity beyond the fact, that descent 
either was particulate or acted as if it were so. I need 
hardly say that the idea, though not the phrase of 
particulate inheritance, is borrowed from Darwin’s pro¬ 
visional theory of Pangenesis, but there is no need in 
the present inquiry to borrow more from it. Neither 
is it requisite to take Weissmann’s views into account, 
unless I am mistaken as to their scope. It is freely 
conceded that particulate inheritance is not the only 
factor to be reckoned with in a complete theory of 
heredity, but that the stability of the organism has also 
to be regarded. This may perhaps become a factor of 
great importance in forecasting the issue of highly bred 
animals, but it was not found to exercise any sensible 
influence on those calculations with which this book is 
chiefly concerned. Its existence has therefore been only 
noted, and not otherwise taken into account. 
The data on which the results mainly depend had to bo 
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