48 Keer CLT CORLSET [sULY 1899 
definite advance being the basis of the next step—is also a purely 
Lamarckian conception, although Mr. Headley attributes it to Eimer. 
As regards Mehnert’s principle of development, summarised by Prof. 
Thomson in the May number of Natwral Science, that, too, is Lamarckian, 
for Lamarck’s work clearly makes out that all progress in organic 
evolution must be studied from the physiological or functional stand- 
point. Hitherto it has been studied almost wholly from the morpho- 
logical point of view. But that this limitation is fallacious must be 
plain if we admit that “the function makes the organ.” 
That any course in evolution can be due to chance, and not to 
responses to environmental changes, is to me unthinkable, for, look 
where we will, consider what we may, law and order prevail in nature. 
Barsanos, W.I., 
May 25th, 1899. 
