H. E. ANNETT. 



331 



Nitrogen in juice. The following table gives an idea of the form 

 in which the nitrogen occurs in date juice. The figures are ex- 

 pressed as grains nitrogen per 100 c. c. of juice : 



The proportion of N precipitated by various reagents is noted 

 below, the total nitrogen originally present being expressed as 100. 



Lead was removed before precipitation with phosphotungs- 

 tic acid and the liquid concentrated to half its bulk. 



METHODS OF ANALYSIS. 



Specific Gravity. This was determined by means of the 

 Westphal balance at Pusa and by hydrometer in camp. 



Sucrose. The juice was first clarified with dry basic lead 

 acetate and the excess of lead removed with sodium phosphate. 

 Readings were then taken in a Schmidt-Haensch ordinary light 

 polariscope before and after inversion. The number of grams 

 sucrose per 100 c.c. was found by the formula : 



(a-b) x 26-048 



143 



2 



where a equals direct reading, 

 b ,, invert reading, 

 t temperature of the readings in C, 



