ANIMAL NATURE OF DIATOME^. 373 



I conclude, however, that in the actual state of 

 science, the Diatomeae are to be enumerated among 

 animals, but at the same time much remains to be 

 accomplished in order to disclose their intimate organi- 

 sation and vital phenomena. In the sadness of the re- 

 flection we are consoled by the saying of the immortal 

 author of ' Cosmos,' that there is a field open for great 

 discoveries where at present we see only scattered and 

 unconnected facts. 



