270 Original Articles. | April, 
Good milk, under a tolerably high power, presents the appearance 
seen in our sketch (Fig. 1). Clustering masses of oil globules, the 
majority of uniform size, may be observed interspersed with a few 
larger, and a number of smaller ones, some being no more than fat 
granules of extreme minuteness. As occasional objects we may 
expect a few dirt particles, epithelial scales, or now and then two or 
three hairs. The appearance of the milk globules is so characteristic, 
that adventitious matters are in most cases discovered at once. 
Fie. 1.—Healthy Milk, 
From the number of oil globules collected together we may form 
some idea of the richness of the milk examined ; but the microscope is 
not the best instrument for testing the proportion of oil globules in any 
given specimen, as in even very poor milk they will probably be col- 
lected in some parts of the field in sufficient numbers to lead to an 
erroneous judgment. In our illustration (Fig. 2) is represented a 
drop of milk so diluted with water as to be nearly transparent. The 
oil globules are seen in considerable numbers, although not in such 
masses as we find in the undiluted fluid. In portions of the specimen 
we should find the quantity apparently much increased by the natural 
flow of them to the most dependent part, and at a is an epithelial 
scale, of which occasionally small masses are discovered. 
° 2 fe) Oo) . (eZ 
90,2 copa? ss 0 Oye 
16) f eS 
0,8. gee oO, & 
o ye) o Oc 
© he? O } 
q P 0°. On 
R e 2 Mi ‘ O. os X QO 
fe) a) 0 
G ° 
: 9 ry Ge eh 4 
f) = Q 
Fig. 2.—Healthy Milk lergely diluted with Water. 
