^ 



xu 



PRE FA CE. 



Reissek, Hartl 



Gros, 



Pringsheim. 



Pineau 



Unmistakeable processes of Heterogenesis have been [ ^vhich has ^ 



watched over and over again by some of the best ob. ' v^ithout havi^ 



servers^ amongst whom may be named Turpin, Kiitzing, 1 \-^q have us t 



Carter' I' tureless AmO 



, -^, _ . of ancestors i 



Trecul. And yet the careful investigations of these I 'that in^ comp 



well-known naturalists have, upon this particular sub- ' but as thin^ 



jectjbeen either wholly disregarded or publicly repudiated • preposterousl 



u„ . i„„j: — u:„i„^:.. 1-„ ^^^ having worked [ sufficient to ' 



I 4 1 * 



Nicolet^ Pouchet^ SchaafFhausen, Braxton Hicks 



by some leading biologists who 



, ^ 



over the same ground themselves — rashly trust to I own Evolutic 



their own theoretical convictions^ rather than to the f the present < 



positive observations of so many workers. How un- [ by which the 



warrantable this conduct has been^ almost any compe- \ aives place 



tent person — however sceptical — may learn for himself^ L of bisexual 



if he will but devote two or three months to the careful 

 study of the changes which are apt to take place in the 

 substance of many of the fresh-water Algae, or in those 

 beautiful green animalized organisms known by the 

 name of Euglense, some of whose marvellous trans- 

 formations were faithfully described more than twenty 

 years 

 memoir of Dr, Gros. 



ago in the highly valuble but much neglected 



The time is doubtless not far distant when it will be 



occur unless 

 which suppJ; 



continually s 

 having to d 

 original proc 



which has b' 

 years with lil 

 to face with 

 repeated bill 

 in a more o 



a source of much wonder that those who had already' f processes th( 



heartily adopted the Evolution philosophy could — even [' the conjoint 



in the face of facts long ago known — stop short of a j conflict with 



belief in the present and continual occurrence of Arche- 5 Like causes 



biosis and Heterogenesis. Do not the very simplest [ P^^^ordial li- 



forms of life abound at the present day ? And^ would I which are ii 



the Evolutionist really have us believe that such forms I by the myiii, 



are direct continuations of an equally structureless matter: I being up^^ 



