155 



Coopemlnr imrk on samples of sweetened condensed milk (percentage results) Cont' 



' nitt-.l from average. 



COMMENTS OF ANALYSTS. 



U .1. BlVftHOM, iriawwn station: The solids were determined in Method A by 

 dr\ in- "ii -ami fi\ . and a hall hours and in \\ hy drying three hours on steam bath and 

 t\\. h..iir- MI h-.t air OVen. 



: Total solids were determined in Method A by 



;i aliiiiiinuiii dish, flirrc hcin"; enough 8and to make a total 



Kvaiiorati'.n \va.- tir-i niad<> on live steam, with frequent stirring. 



Tin- di-h ua- iln-n wiped dry and put in a drying oven at 100 for thirty minutes, 

 and wri^lird, th'-n ai, r ain hcatrd three hours, and for seven hours. 



Per cent. 

 Av.-nio for thirty minute* .............................. .. .................. 72. 74 



/Lvenge I-T thn-.- hours ..................................................... 72. 40 



A\ t r . ,!! Imurs ................................................... 72. 11 



In MftluNl \\ th- manipulation was the same as in A, except that no absorbent was 

 used. Average for heating thirty minutes was 73.58 per cent; for two hours, 73.60 per 

 cent. 



In th- doiiM' M method for fat the first and second extractions were made 



iWriirhi hours ea h and the third for four hours. In the centrifugal method the 

 pi|><-Ho \\a- rins.'d into the h"ttle. 



\lnrijlaml stntinn: The methods involving dilution of a 40 per cent 



formed by inverting the milk suuar evidently has a different reducing capacity from 

 dextrose and levuln.^-. In the .use of the Leach- Babcock test for fat one can readily 

 see that err-T- < an reep in while drawing off the supernatant fluid in three instances. 



/ It. Hnlhind, Massachusetts station: Solution: A 20 per cent solution was pre- 

 pared hy diluting KM) Drains of the milk to 500 cc. There was some separation of curd 

 "r far. presumably the latter, \vhichmusthavevitiatedtheresultstosomeextent. 



MoiMun-: S.-\i-ral aliquotsof 5and 10 cc were evaporated on quartz sand in a flat* 

 l>o itemed di.-h at a low temperature until the bulk of the water was expelled, then 



