FATS. 



73 



CHYLE, from commencement of Thoracic Duct, 

 from the Dog. 



granules are to be seen which Fig. H- 



measure 2.5 mmm. in diameter ; 

 but they are generally much 

 less than this, and the greater 

 part are so small that they can- 

 not be accurately measured. 

 (Fig. 11.) For the same reason 

 they do not present the bril- 

 liant centre and dark border of 

 the larger oil-globules ; but ap- 

 pear by transmitted light only 

 as minute dark granules. The 

 white color and opacity of the 

 chyle, as of all other fatty emul- 

 sions, depend upon this mole- 

 cular condition of the oily in- 

 oredients. The albumen and 



O 



salts, which are in intimate 



union with each other, and dissolved in the water, would alone make a 

 colorless and transparent fluid; but the oily matters, suspended in 

 distinct particles, with a different refractive power from that of the 

 serous fluid, interfere" with its transparency, and give to the mixture 

 the white color and opaque appearance which are characteristic of emul- 

 sions. 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. 

 12), the oil-drops, or "milk- 

 globules," are not quite fluid, 

 but have a pasty consistency, 

 owing to the large quantity of 

 palmitine which they contain, in 

 proportion to the oleine. When 

 forcibly amalgamated with each 

 other and collected into a mass 

 by prolonged beating or churn- 

 ing, they constitute butter. In 

 cow's milk, the globules vary 



somewhat in size, but their average diameter is 6 mmm. They are 

 suspended in the serous fluid of the milk, and by heating may be more 

 perfectly liquefied, and made to assume a circular form. 



In the cells of the laryngeal, tracheal, and costal cartilages (Fig. 13) 

 there is always more or less fat deposited in the form of rounded glo- 

 bules, somewhat similar to those of the milk. 

 6 



Fig. 12. 



GLOBULES 



Cow's MILK. 



