scarcely be called sciences. In a quite analogous manner, 

 he v/ho surveys the development of biological science can 

 not but be struck by the great advances which followed the 

 formation of the cell theory. IVhat the atom is for physics 

 and chemistry the living cell is for biology: and it is 

 not surprising that the discovery and identification of 

 the unit of living matter was followed by just as inarvel- 

 0U8 a development in the science of living matter as succeed- 

 ed the conception of the unit of non-living matter. But when 

 we turn to look for the intensive study of living matter, 

 and the scientific advancement which would just as surely 

 follow this study, v/e are doomed to some disappointment. 

 The intensive study of the living cell has for years been 

 limited tcr one method: namely, the study of the dead cell 

 with the hope of finding out more about the living cell. 

 The results which have been obtained by the use of this 

 method have been very instructive as far as they have gone^ 

 but it is to be expected that this method alone would have 

 its limitations; and in fact it would seem that this aspect 

 of cell study has already been pushed as far as may profit- 

 ably be done. It is a logical conclusion that the biolo- 

 gist must now turn his attention to the more difficult task 

 of the direct study of the living cell: but may he not feel 

 confident that the:^.e studies will be rewarded by a progress 

 quite ev^ual to the recent progress in physical science? 



(3) 



