TABLES. 



289 



TABLE VIII. 



PER CENT OF BUTTER IN MILK, BY VOGEL'S OPTICAL .MILK 



TEST. 



C.C. of 

 milk re- 

 quired. 



2.50 

 2.75 

 3.00 

 3.25 

 3.50 

 3.75 

 4.00 

 4.25 



«|nOf 



butter. 



9.51 

 8.73 

 7.90 

 7.41 

 0.80 

 0.44 

 0.03 

 5.70 



C.C 



milli 

 iised 



of 



4.50 

 4.75 

 5.00 

 5.25 

 5.50 

 5.75 

 0.00 

 6.25 



«|o of 



butter. 



5.38 

 5.13 

 4.87 

 4.66 

 4.45 

 4.26 

 4.09 

 3.94 



I C.C. of 1 «ioOf 

 milk butter, 

 used. 



0.50 

 6.75 

 7.00 

 7.25 

 7.50 

 7.75 

 8.00 

 8.25 



3.80 

 3.06 

 8.54 

 3.43 

 8.32 

 3.22 

 3.13 

 3.04 



TABLE X. 



COMPOSITION OF AGRICULTURAL MATERIALS AND PROD- 

 UCTS IN 1000 PARTS OF THE SUBSTANCE. 



From this Table the student may gain some idea of the 

 chemical composition of the m.ore important substances 

 relating to agriculture ; although since this composition 

 varies so. widely with varying circumstances, no great 

 degree of precision can be claimed for statements of so 

 general character, with whatever care they may be pre- 

 pared. 



The extreme and the average composition are given ; 

 the latter is to be taken, however, as indicating not the 

 real mean of all the reliable analyses of the substance 

 that have been made, but rather as an approximation to 

 the proportion of each clement or compound that is gen- 

 erally found in the substance ; in some cases the propor- 

 tion of a component ranged too evenly from one limit to 

 the other of the extremes to admit of estimating any 

 javerage of this kind. Fuller details may in some cases 

 be found in the admirably arranged tables at the end of 

 Frof Johnson's "How Crops Grow." 

 13 



