50 



THE MUCIN OF WHITE 



VL 0.2495 gram of substance gave, by the Kjeldahl method, 0.02825 gram 



of nitrogen = 11.82 per cent N. 

 VIL 0.2674 gram of substance gave, by the Kjeldahl method, 0.02930 gram 



of nitrogen = 11.38 per cent N. 



VUL 0.6046 gram of substance gave, by fusion with NaOH + KNO,, 0.1045 

 gram of BaSO 4 = 2.38 per cent S ; after deducting sulphur of ash = 

 2.31 per cent S. 



IX. 0.5408 gram of substance gave, by fusion with NaOH+KNO,, 0.0931 

 gram of BaS0 4 = 2.37 per cent S ; after deducting sulphur of ash = 

 2.30 per cent S. 



X. 0.3128 gram of substance gave 0.0031 gram of ash = 0.99 per cent ash. 

 XI. Ash from 0.3128 gram of substance gave 0.00152 gram of BaS0 4 = 0.07 

 per cent S. 



C 



H 



N 

 8 

 O 



PERCENTAGE COMPOSITION OF THE ASH-FBKE SUBSTANCE. 



Average 



48.17 48.26 48.34 48.26 



6.46 6.69 ... 6.44 6.49 



11.51 



2.31 2.30 2.31 

 81.43 



100.00 



11.69 11.43 11.60 



A comparison of the composition of these three preparations 

 of mucin with each other, and with the mucin analyzed by 

 Loebisch and by Hammarsten, brings out certain points of 

 interest which merit attention : 



Loebisch analyzed three distinct preparations of mucin from 

 ox tendons, in which the carbon, hydrogen, and sulphur 

 showed practically no variation. The nitrogen, however, 

 varied from 11.59 to 11.84 per cent. The average content 

 of nitrogen in his three preparations was 11.75 per cent, 

 identical with the average of our three preparations. It is to 



