PAAL AND AMBERGER'S METHOD. 253 



4 c.c. of a 20 per cent, cadmium sulphate solution are added. 

 The precipitate is collected on a Gooch crucible, washed with 

 not more than 50 c.c. of water, dried, and weighed. The weight 

 calculated as milligrammes, gives the cadmium figure. The 

 figure for butter usually lies between 70 and 90, and for coco- 

 nut oil 441 to 470 ; higher results (100 or above) were obtained 

 from the fat of milk yielded by cows fed on large quantities of 

 coconut cake or beetroot leaves. 



