ANALYTIC PROCESSES 2I 
kept. It should be clear and not very dark in 
color. It is best kept in a bottle provided with a 
pipet which can be filled to the mark by dipping. 
Rigid accuracy in the measurement is not needed. 
[The Leffmann-Beam method is often erro- 
neously called the ‘‘Beimling’” method, but 
Beimling was merely the deviser of a cheap 
centrifuge. To protect the interest of a manu- 
facturer who had invested in the Beimling 
machine under the impression that it was a 
practicable method for fat estimation, it became 
necessary for Leffmann and Beam to take out a 
patent (now expired) and assign the same to this 
investor.] 
Calculation Methods.—Several investigators 
have proposed formule by which when any two 
of the data, sp. gr., fat, and total solids, are 
known, the third can be calculated. These differ 
according to the method of analysis employed. 
That of Hehner and Richmond, as corrected 
by Richmond, was deduced from results by the 
Adams method of fat extraction. It is: 
T=025G+1.2F + 0.14; 
in which T is the total solids, G the last two figures 
of the sp. gr. (water being 1000), and F the fat. 
Patrick has proved that with American milks the 
constant should be dropped, the formula reading: 
T=025G+1.2F 
