64 ENDOSMOSE. LiECT. III. 



some time, we observe that, at the commencement of the 

 experiment, there is a slight elevation sometimes equal in 

 both instruments; sometimes greater, sometimes less, in 

 the one than in the other; but the liquid soon descends. 

 By changing the position of the liquids, that is to say, by 

 putting the solution of gum outside, and the pure water 

 within the instrument, the water descends. 



Stomach of the Dog. The same phenomena were pro- 

 duced when we employed the stomach of the dog. We 

 have not made any experiments with the stomach of the 

 latter animal immediately after its death, using for the in- 

 ternal liquid an albuminous solution. The results which 

 we have now explained were made several hours after the 

 death of the animal. The albuminous solution rose to an 

 equal height in the two instruments in four different experi- 

 ments. In one of them, which we select from amongst the 

 others, this elevation was 20 millimetres in one hour; and 

 it did not vary for three hours more, in the endosmometer 

 where the internal surface of the stomach was towards the 

 interior of the instrument, whilst in the same interval of 

 time it fell 25 millimetres in the other endosmometer. In 

 general, it rarely occurred that the column remained sta- 

 tionary in either of them. In most cases (we always refer 

 to the membrane of the stomach of the dog when it is not 

 fresh) the liquid descended in both instruments after having 

 manifested a greater or less elevation ; but the diminution . 

 of height was double, and often treble, in the endosmo- 

 meter in which the external surface of the membrane was 

 turned towards the albuminous solution. By reversing the 

 position of the liquids, and placing the solution of white of 

 egg outside, and the water inside the endosmometers, we 

 found that the internal liquid descended equally in both. 

 These depressions are caused by the cessation of endos- 

 mose, in consequence of the alterations supervening in the 



