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New York AGRICULTURAL E\XPERIMENT STATION. 16 
be caused by the cells becoming through long continued lactation 
unable to retain the larger globules which characterize the earlier 
secretions ? ; 
Certainly it would be desirable to discover some mode of treat- 
ment or method of feeding by which the size of these globules 
could be increased, thus increasing the yield of fat and facilitat- 
ing many of the operations of the dairy. 
The following table and diagram show the changes in diameter 
and volume of fat globules between the first and twelfth month 
of lactation. 
The great increase in the percentage of globules of small 
diameter given is very marked, and an equally marked decrease in 
the percentage of the larger globules; and since the volumes vary 
as the cubes of the diameters, these differences are more strongly 
marked. It will be seen that during the first month 39.3 per cent 
of the fat was in globules less in diameter than three divisions of 
the micrometer scale and nearly sixty-one per cent in the larger 
globules, while in the,twelfth month fifty-nine per cent of the fat 
was present in globules less than three divisions in diameter, 
while but forty-one per cent was present in the larger globules. 
In the graphical chart the upper margin shows the percentages 
of volumes in the globules of different sizes as also the per- 
centages of the globules of the different sizes given upon the left-_ 
hand margin. A glance shows that the change is a shifting in 
each case of the line representing diameters or volumes to the 
right-hand corner, or a general diminution of the diameter of the 
globules, and general increase in the volume of fat in the small 
globules. For example, during the first month of lactation there 
was abovt ten per cent of the fat in globules less than two micro- 
meter scale divisions, while in the twelfth month there was uver _ 
twenty per cent of the fat present in globules less than two 
divisions in diameter. So too in the first month there was less 
than eighty per cent of the globules under three divisions in 
diameter, while in the twelfth month there were ninety per cent 
under three divisions in diameter. It will also be seen how very 
small a percentage of the fat is present in the globules less than 
one division in diameter, although the number of globules is 
pretty large. . 
21 
