1864. | Vorioxer on Milk, and Dairy Arrangements. 271 
In the event of pus, or blood, being mingled with the milk, it is 
evident that the gland is diseased ; such elements could hardly be 
introduced by accident, and of a certainty would not be so intention- 
ally. The appearance of the pus globule is very marked, as will be 
seen by reference to our drawing (Fig. 3, a). The faint outline, com- 
pared with the well-marked boundary of the oil globule, with the 
granular character and greater size, will be sufficiently distinctive ; 
further evidence may be obtained by the addition of a small quantity 
of acetic acid, under whose action the nuclei of the pus cells soon 
become apparent, as at b and c, while the cell wall is gradually dis- 
solved. 
Fie. 3.—Milk with Pus. 
The detection of blood discs is not so easy, for although they 
are essentially different from milk globules, their shape is materially 
altered by combination with the milk, which causes them to swell up 
and lose their peculiar dark centre. After the specimen, however, has 
been allowed to dry on the glass, the characteristic appearance is 
restored, and the blood dises are then very easily recognized. 
The last Figure (4) represents blood discs in the milk, after being 
Fic. 4.—Milk with Blood. 
