GERMICIDES AND ANTISEPTICS 331 



development, the struggle for existence, natural in- 

 crease, geographical distribution, and many other 

 known and unknown forces might have produced 

 the different forms of the animal and plant world, 

 which inhabited the earth in the past as they do in 

 the present. We know that in the maintenance of 

 such views we' stray far from the boundaries of 

 biological science ; but we find the biologist, always 

 remaining conscious of the limitations of his know- 

 lodge, admitting his ignorance with resignation, 

 foiled in his experiments and observations, not 

 always resisting the longing of Faust, ' Zu schauen 

 alle Wirkungskraft und Samen,' but gladly giving 

 himself up to the allurement of filling with some 

 fantasy that blank in which modern investigation 

 has failed. 



