CHAP. II.] 



COMPOSITION OF PEPTONES. 



143 



The following table exhibits the percentage composition of the 

 various samples of peptones, .^calculated on the ash-free substance. 

 The ash found, consisted in every case of calcium, a little sodium, 

 potassium, traces of barium and iron, carbonic acid, phosphoric acid 

 and sulphuric acid, and its amount is placed at the foot of the columns. 



