124 THE GERM THEORY OF DISEASE. 



and the toxic or urinary product. A sufficient number of 

 these have now been studied for us to gain some notion of 

 them; yet our knowledge is still limited to a few forms 

 among the bacteria and their allies. The best known is the 

 yeast plant. In this we have alcohol, succinic acid and glyce- 

 rine, as the urinary excrement. The bacterium lactis produces 

 lactic acid ; the mycoderma aceti produces acetic acid. These 

 names properly represent so many families, each of which 

 contains a number of varieties. Saccharine substances form 

 suitable food for them all. Two of them will, however, grow 

 equally well in substances not saccharine. Another form 

 produces butyric acid; another, a kind of mucus; another, 

 ammonia; while others still, produce as their waste products, 

 all of the ill-smelling products of putrefaction. I append a 

 table of those best known, in connection with a table of the 

 waste products of other forms of life, for comparison. 



TABULATED STATEMENT OF THE WASTE 

 PRODUCTS OF VARIOUS ORGANISMS. 



RESPIRATORY PRODUCTS. TOXIC PRODUCTS. 



ANIMALS. 



Carbonic Acid....... C0 2 Urea CH 4 N 2 



Creatine C 4 H 9 N 3 2 



Creatinine C 4 H 7 N 3 



Uric Acid C 5 H 4 N 4 3 



Hippuric Acid C 9 H 9 N, 3 



PLANTS. 



Carbonic Acid C0 2 Theine C 8 H 10 N 4 2 



Oxygen Veratrine C 32 H 52 N 2 8 



Morphine C 17 H 19 N0 3 



Quinine C 20 H 24 N 2 2 



Strychnine C 21 H 22 N 2 2 



Atropine C^HgsNOg 



Piperine C 1V H 19 N0 3 



