386 



Royal Society : — 



more than three (or perhaps four) rabbits by injecting air, although 

 the removals and replacements of the syringe were very numerous, 

 often ten times in a single operation of the w kind. 



My apparatus consisted of a zinc vrarm-vpater bath, represented on 

 the left of the diagram below ; the vessels drawn to the right of it 

 fitted into holes in its lid, as indicated by the letters. A is the basin 

 to catch the supply-blood ; it was whipped up by the whisk F ; then 

 poured into C, which consists of a short funnel with muslin below, 

 resting in the top of a glass measure ; when the blood had strained 

 through, tlie funnel and muslin were set on the top of D, to get 

 them out of the way and, at the same time, to keep them warm Tor 

 future use ; B is the thermometer ; E is a spill -case full of water to 

 contain the syringe. In addition to these, I required a large slop- 

 pail, a jug of hot, and another of cold water. 





The sketch shows my latest outfit of basins and warm water for 

 injecting. It was not perfected until I had nearly finished the 

 experiments. Scrupulous cleanliness is requisite, and great orderli- 

 ness ; for the hazard lies, not in the performance of one difiicult 

 operation, but in making a mistake in some one of a great many 

 easy operations. The course of an operation was as follows : — 

 (1) secure the animal, (2) remove fur from neck, (3) anaesthetics, 

 (4) expose jugular, (5) cut a slit in it and let the animal bleed 

 as much as he can easily bear, about six drachms, (G) stop the 

 flow with gentle pressure by spring forceps ; the animal was then 

 left for a minute while (7) Dr. Murie and Mr. Fraser divided the 

 throat of the supply-rabbit, I catching the blood in a warmed basin 

 and whipping it up, to defibrinize it, as it fell. I continued doing 

 this while Dr. Murie was (8) inserting the canula ; and when he 

 was nearly ready he called to me, and I (9) filtered the blood, noting 

 its amount, as a guide to what I had to dispose of, (10) drew up a 

 syringe full, (11) injected a convenient number of drachms or half 



