MILK. 231 



Rule : To find pet- cent of solids not fat, add tzuo tenths of 

 the per cent of fat to one fourth of the lactometer reading. 



To find per cent of total solids, add one and two tenths times 

 the per cent of fat to one fourth of the lactofneter reading. 



Results obtained by using the short formulas will agree 

 very closely with those derived from the general formula, 

 or from the tables published below, and may be safely 

 relied upon in practical work. 



The tables cover a range of .o to 6.0 per cent of fat, 

 and from 26 to 36 lactometer reading. If intermediate 

 values for /and L are at hand, corrections in the per cent 

 of solids not fat found may easily be made, with .02 per 

 cent for every tenth of one per cent of fat, and .25 per 

 cent for every lactometer degree. Example: Given / = 

 3.67 per cent and L = 32.5. By referring to the table we 

 find that f — '^.b and L — yi will give 8.73 per cent of 

 solids not fat; correction for fat-content, .01 per cent (3.67 

 being nearer 3.65 than 3.70), and for lactometer reading, 

 12 per cent; corrected per cent solids not fat, 8.86. 



