34 



THOMAS MACFARLANE ON ASBESTOS IN MILK ANALYSIS. 



other, and exhausted in the usual manner, with petroleum ether for three or four hours. 

 The fat from all the assays is thus extracted and collects in the flask beneath the Soxhlet. 

 The assays are then removed, dried in the steam bath, cooled in the desiccator and 

 weighed in the same manner as before. The loss represents the butter fat. The following 

 table shows the results obtained from a series of milk samples tested in duplicate : — 



I may remark that No. 34*7 is evidently a skimmed milk ; No. 352 has been watered ; 

 No. 172 b is the same as 172 «, but with the addition of ten parts of water, to ninety of 

 No. 172 a. The manner in which the duplicate results agree shews that the method is 

 worthy of confidence. 



