PATS. 



91 



Fig. 11. 



by transmitted light only as minute dark granules. The white 

 color and opacity of the chyle, as of all other fatty emulsions, 

 depend upon this molecular condition of the oily ingredients. The 

 albumen, salts, &c., which are in intimate union with each other, 

 and in solution in the water, would alone make a colorless and 

 transparent fluid ; but the oily matters, suspended in distinct par- 

 ticles, which have a different refractive power from the serous fluid, 

 interfere with its transparency 

 and give it the white color and 

 opaque appearance which are 

 characteristic of emulsions. 

 The oleaginous nature of these 

 particles is readily shown by 

 their solubility in ether. 



In the milk, the oily matter 

 occurs in larger masses than 

 in the chyle. In cow's milk 

 (Fig. 11), these oil-drops, or 

 "milk-globules," are not quite 

 fluid, but have a pasty con- 

 sistency, owing to the large 

 quantity of margarine which 

 they contain, in proportion to 

 the oleine. When forcibly amalgamated with each other and 

 collected into a mass by prolonged beating or churning, they con- 

 stitute butter. In cow's milk, 

 the globules vary somewhat 

 in size, but their average 

 diameter is 4 oW f an inch. 

 They are simply suspended 

 in the serous fluid of the 

 milk, and are not covered 

 with any albuminous mem- 

 brane. 



In the cells of the laryn- 

 geal, tracheal, and costal car- 

 tilages (Fig. 12), there is 

 always more or less fat de- 

 posited in the form of rounded 

 globules, somewhat similar to 



n , .,, CKI.T.S op COSTAL CARTILAGRS, containing Oil- 



those Of the milk. Globules. Human. 



GLOBULES OF Cow's MII.K. 



Fig. 12. 



