CHEMICAL PHENOMENA 

 IN LIFE 



CHAPTER I 

 BIOLOGY AND CHEMISTRY 



THE establishing of the close connection of the 

 biological and the chemical methods of in- 

 vestigation, so familiar in our days to all who are 

 interested in science, was by no means an easy 

 achievement. On the contrary, this was one of 

 the most important and most difficult steps taken 

 in the glorious era of the great French Encyclo- 

 paedists and Philosophers. Chemistry aims at 

 showing the diversity of matter. It tries to 

 separate and to select, to outline the general laws 

 of proportion in quantity and weight in matter, 

 and it does not appeal directly to our senses. 

 It is only experiments that step by step unveil the 

 clouded path of the investigator and lead him up 

 to the heights from whence he has a clear and far- 

 reaching view over the silent fields of Nature. 



Chemical and physical experiments are said to 

 show the laws of Nature. But what do we call 



