
New Vo Acrrourturat Exreeneeyr STATION. 161 
| Bencerniny the changes that heath undergo, all is uncertain 
and doubtful ; possibly may be oxidized somewhere into carbonic — 
acid and ne 
Il. Fats. In the mouin fat undergoes no change, except when 
some of it is formed into a very feeble emulsion. On the fats 
that enter the stomach, the gastric juice has at most, a limited 
- action. In pieces of tissue containing fat, the connecting tissue 
_ binding the fat cells together and the envelopes of the fat cells 
_ are dissolved, so that the fat fluid at the temperature of the body, 
is set free from the individual cells and runs into larger and 
smaller masses. Next in order the bile has a slight solvent ~ 
action on some of the fats and also makes an emulsion with some 
of the fats. With the fatty acids present the bile forms soaps. The 
_ pancreatic juice also emulsifies some of the fats and also splits a 
' little up into free fatty acids and glycerine, but by far most of 
_ them remain as neutral fats. The neutral fats so emulsified pass 
_ in the first instance into the bodies of the columnar cells of the } 
 yilli. How the fat enters into the substance of the cell we do 
not know. From the columnar cell the fat passes into the spaces 
of the reticular tissue of the villus. From the labyrinth of spaces 
‘of the reticulum of the villus, the fat passes into the cavity of 
_ the lacteal radicle. Up to this point it was merely emulsified 
fat, but after passing into the lacteal radicle it becomes “ chyle.” 
_ The condition of the fat in chyleis peculiar. Some of it exists, 
_ like the fat in milk, in the form of fat globules of various sizes, 
_ but all small. A very considerable quantity, however, is present 
in the form of exceedingly minute spherules or granules, far 
smaller than any globules to be seen in milk. 
. We may probably infer with safety that all or at least very 
nearly all the fat absorbed from the intestine takes the path of 
the lacteals. It may be that in some way, on its course, in the 
lymphatic glands, for instance, the fat is taken away from the 
chyle, hidden so to speak somewhere away from both chyle 
and blood; but on this point we have no exact information. We 
might infer from this that an excess of fat thus entering the blood 
would naturally be disposed of by being simply stored up in the 
available adipose tissue without any further change; we can 
imagine that the fat, not immediately wanted by the economy, | 
; 21 ; 
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