— ay eR arr, ees kon eae a 
vette ere Sg ea ct isto a! a he, 
or é ’. % 
0 Se ea tans 
tr Ca 
and the pipette weighed again. The milk in the evaporator is then 
dried at 100° C. until the weights taken one-half hour apart do not: 
vary more than a milligram from each other. 
The asbestos serves as an absorbent of the milk, and presents a 
large surface which greatly facilitates the drying. For this purpose 
asbestos is much to be preferred to sand or any fine powder which re- 
quires frequent. stirring for complete dessication. When a number of 
analyses are to be made in succession, a second portion of milk may 
be dried in the same asbestos with advantage. In the series of 
analyses made during the feeding experiments the morning’s and 
evening’s milk were dried together in this way. The dried residue 
may be ignited for ash (section 7). 
The figures given for solids in all analyses made during the year 
have been determined in the above manner. The solids may, how- 
ever, be found with equal accuracy and in much less time by the 
method given below. 
In the bottom of a perforated test-tube, such as is used in the esti- 
mation of the fat in fodders, is placed a tuft of clean cotton. ‘The 
tube is then filled three-quarters full of ignited asbestos and a plug of 
cotton inserted to prevent the escape of loose fibers of asbestos. ‘The 
asbestos must be slightly pressed together so as to leave no large 
spaces. ‘The tube and contents are weighed, the plug of cotton care- 
fully removed and five grams of milk, from the weighed pipette, de- 
scribed before, run into it and the plug of cotton replaced. The tube, 
connected at its lower end by arubber tube and adapter with a filter 
pump, is placed in a drying oven at 100° C. and a slow current of dry 
air drawn through it, till the water iscompletely expelled, which in no 
case requires more than two hours. 
The weights of tube and contents, in two instances, after drying 
different times, are given below. , 
Time dried. 1 hour. 1% hours. 14 hours. 2hours. — 
Weight of tube I.... 15.8774 ~— 15.8646 15.8640 15.8637 
Weirht of tube tion). s(1d 2868's" Lon ia 13.2840 13.2840 
The method gives accurate results as is shown by the following de- — 
terminations made in this way and by drying in an evaporator with 
asbestos. 
Sotrps IN MILK. 
Dried in evaporator Dried in asbestos 


‘with asbestos. with current of air. 
1a SE fs hh Seen aia ee ea 14.93 14.88 
MRC te alah geomet als ’avelin dr ana cetatalolle ateted sta hine 14.62 14.58 
ESAT Wie dial esele seid Siac vel «pet te oie bgt el ia te WattE ete 15.31 15.35 
PCRS ic le iu taset oteiginite eS bTEN Feonus tee apys 15.47 15.51 
BP EASVSkie chad Sle Wwe bie eSeist ooeoute wicvermerene 14.18 14.15 
Bat OR tisiiters RLM pe oN GPa tay 14.84 14.81 
RADIA dabce hice iets Died pukka cowed baits bcs Beglle alate 13.96 13.94 
ra Bile pe Pag das Sah Gan TaN Ne PEE Mees At de Lp 15.23 15.25 
FETE HEAD ERAS (sia taveta intehoasc ge lena a oiete octets 13 261 13.61 
TVA, oct ecatinanty Shee Site he anne reeez ey 14.66 14.70 
Average of 96 determinations.... 14.44 ; 14.42 
—_—_—_—_ —_— 
Se ee ae 

