EXPERIMENTAL PHYSIOLOGY. 
509 
April 4.—The chicken alive and healthy with the cotton 
still in situ. 
This experiment would seem to show that a large amount of 
the Heloderma saliva can be inserted into the tissues without 
producing any harm, and it is still a mystery to the writer how 
Drs. Mitchell and Richert and himself obtained entirely differ¬ 
ent results. Were it not for the well-known accuracy and care¬ 
fulness of Dr. Mitchell it might be supposed possibly that the 
hypodermic syringe used in his experiment contained a certain 
amount of Crotalus or cobra venom, but under the circumstances 
such a hypothesis is entirely untenable. Moreover no local 
symptoms were manifested, as would have been the case had 
venom been inserted. Both the Gila monsters were good-sized 
active specimens, full of vigor, secreting a considerable amount 
of saliva, and we can hardly suppose that the short captivity they 
had suffered could have so modified their saliva as to render it 
innocuous. 
{To be continued ). 
EXPERIMENTAL PHYSIOLOGY. 
THE GRAPHIC METHOD FOR THE STUDY OF THE PAROTID 
SECRETION IN THE HORSE. 
By Prof. Kaufman, of Alfort. 
The markings obtained by the Professor have confirmed the 
following characters, already indicated by Colin, in his experi¬ 
ments through the means of simple fistulas : 
1st.—The parotid secretion in the horse is intermittent. 
2d.—It is entirely stopped between meals. 
3d.—It takes place through both glands during mastication. 
4th.—But at that time it is equal in both. 
5th.—It is more abundant on the side where the animal mas¬ 
ticates, and less on the opposite. 
6th.—If the mastication passes from one side of the mouth to 
the other, the changes in the abundance of the secretion occur in 
the same manner. 
