The Neo-Lamarckian School 
we cite Cope, Spencer, Orr, Eimer, Naegeli, 
Henslow, Cunningham, Haeckel, Korchinsky, 
and a number of others. It may almost be said 
of these Neo-Lamarckians that each holds a 
totally distinct theory of evolution. So hetero- 
geneous are their views that it is difficult to find 
a single article common to the evolutionary belief 
of all. It is commonly asserted that all Neo- 
Lamarckians are agreed, firstly, that acquired 
characters are transmissible ; and, secondly, that 
such transmission is an important factor in the 
production of new species. This assertion is 
certainly true of the great bulk of Neo- 
Lamarckians, but it does not appear to hold in 
the case of those who believe that evolution is 
the result of some unknown inner force. So far 
as we can see, a belief in the inheritance of 
acquired characters is not necessary to the 
theories of orthogenesis held by Naegeli and 
Korchinsky. For that reason it would possibly 
be more correct to place those who hold such 
views in a fourth school. Since, however, a 
number of undoubted Neo-Lamarckians, as, for 
example, Cope, believe in an inner growth-force, 
it is convenient to regard Naegeli as a Neo- 
Lamarckian. His views need not detain us long. 
Those who wish to study them in detail will find 
them in his Mechanztsch-phystologische Theorwe 
der Abstammungslehre. 
Naegeli believes that there is inherent in 
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