. III. STOMACH OF THE CAT. 63 



ternal surface of the membrane was in contact with the gum 

 solution ; and 8 millimetres, when the position was reversed. 

 The intensity of the endosmose between the water and the 

 gum solution is excessively weak when it is exerted through 

 the mucous membrane of the stomach of the lamb ; and it 

 is necessary, therefore, to prolong the experiment beyond 

 the ordinary time, in order to obtain a sufficiently obvious 

 elevation. Those we have now mentioned, were obtained 

 after more than four hours experimenting. It must also be 

 observed, that the current of endosmose through the mem- 

 brane soon ceases when we employ the two liquids now 

 referred to. Indeed, it often happens that the solution of 

 gum, after having attained a slight elevation, does not ex- 

 ceed this at the end of two hours, nor even by prolonging 

 the experiment for many hours. 



The favourable position for endosmose between water 

 and the solution of sugar, which we have observed when 

 we use the stomach of the lamb, is not the same when we 

 employ the stomach of the cat and the dog ; with the sto- 

 mach of the cat, the elevation to which the solution of 

 sugar reached in the tube of the instrument was either 30 

 millimetres or 15 millimetres, according as the internal sur- 

 face of the membrane was placed towards the interior o* 

 the instrument, or had the reverse position. With the sto- 

 mach of the dog, the elevation was, in the first case, 68 

 millimetres, and, in the second, 8 millimetres. 



Stomach of the Cat. With the stomach of the cat, en- 

 dosmose from water to the solution of gum is also directed 

 from the external to fhe internal surface of this organ. 

 Thus, when the mucous surface of the membrane is in con- 

 tact with gum water, the elevation reaches 38 millimetres, 

 and when in the other position, only 14. This difference 

 is observed only when the stomach is very fresh ; should 

 the animal from which it has been taken, have been dead 



