^ INTRODUCTION 



of the Lamarckian period gave little heed to the finer details of 

 internal organization. They were concerned mainly with the more 

 obvious characters of plants and animals — their forms, colours 

 habits, distribution, their anatomy and embryonic development — 

 and witli the systems of classification based upon such characters- 

 and long afterwards it was, in the main, the study of like characters 

 with reference to their historical origin that led Darwin to his splen- 



a 









F IWt'-'^^-'^^ 



\ 



I "^l^^^^r 





X 



b 



did triumphs. The study of micro.scopical anatomy, on which the 

 cell-theory was based, lay in a different field. It was begun and long 

 carried forward with no thought of its bearing on the oHgin of living 

 forms; and ev;en at the present day the fundamental problems k 

 organization with which the cell-theory deals, are far less accessible 



o2Trt "T""^\ '^'" '^"■'^^ suggested by the more obvious, 

 cxteinal characters of plants and animals. Only within a few years 



