52 



LIFE S BEGINNING ON THE EARTH 



vapor. Two special apparatuses serve to retain the water 

 vapor and the carbon dioxide gas. The increase of weight 

 of each of these serves to determine the amount of water 



Fig. 26. Justus von Liebig (1803-73) 



Professor of Chemistry at the University of Giessen, Germany, 1824-52; 

 noted for his epoch-making chemical discoveries; he founded the science 

 of organic chemistry and organized the first modern chemical research 

 laboratory. 



and of carbon dioxide formed. From (he figures thus ob- 

 tained the carbon and the hydrogen content of the fat can 

 be calculated. By this and other new methods, Liebig be- 



