THE SNAPPING TURTLE. 221 
The instrument used in the following experiments was the hemometer of Magendie, 
as modified by M. Bernard.* The blood was kept fluid by filling the caoutchouc tube of 
the instrument with a saturated solution of carbonate of soda, which was found to displace 
two millimetres of mercury in the registering tube. Accordingly a reduction to this 
extent from the record of blood-pressure has been made in each instance. Any further 
description of an instrument so well known to physiologists would be altogether unne- 
cessary. 
ExpErIMENT.—Turtle weighing twenty-two pounds, from Delaware. Temperature of 
air 73° F. Present, Messrs. Keene, Stone, and Cantrell. The Turtle having been pro- 
perly secured so as not to impede the circulation or respiration, a tube was placed in the 
left femoral artery and connected with the caoutchouc tubet of the hamometer, when the 
following record was obtained after a few minutes’ repose: 
TIME. PRESSURE. REMARKS. 
Minimum, Maximum. 
4.4] P.M. 30 wm. = 40 MM. Pulse 28 to the minute. 
4.42 35 45 Respiratory act. 
4,44 33 43 
4.46 33 45 Slight respiration. 
4.47 30 38 
4.49 36 43 Respiratory act. 
4.504 32 40 
4.524 27 37 After respiration. 
4.53 33 42 Cleaned tube, no clot in it. 
4.56 29 38 
4.57 28 37 When violent movements took place, during which the 
pulse became too irregular for notation. The ex- 
tremes reached, were 
23 49 
4.573 26 35 No clot in tube. 
4,58 27 37 
28 37 
25 33 
30° 40 A full respiratory act. 
5.6 28 3 After respiratory act. 
30 42 
5.12 to 27 37 
5.15 } 29 37 Pulse 28. During respiration and violent motion, 
the limits were 
29 43 
During several minutes, 29 36 Steady pulse. 
June 18th, 1861. Present, Messrs. Keene, Stone, and Cantrell. 
Experment No. 2.—Temperature 71° F. Snapping Turtle. Weight twenty-two 
* Legons sur les Propriétés Physiologiques et les Altérations Pathologiques des Liquides de Y Organism, par 
M. Cl. Bernard.—T. I, p. 167. Paris, 1859. 
{ This tube was so thick as to withstand perfectly the dilating force thus brought against it. 
