•288 EXPERIMENTAL IXVESTIGATION OF THE ACTION OF MEDICINES. 



between each two perpendiculars, and reckoning from the time 

 Ijetween them what the rate of pulse or respiration will be in a 

 minute. As the rate of both may change several times in a 

 minute, and a calculation of this sort would lead to consider- 

 able error, we not unfrequently take 15 seconds as the unit of 

 time instead of a minute. 



The way in which the numbers thus obtained may be 

 tabulated, is shown by the following examples of supposititious 

 experiments. These examples have been made by piecing 

 together several experiments of Von Bezold, and sliow generally 

 the action of atropine, but must not be regarded as accurate 

 descriptions of any one experiment. 



Even when a continuous roll of paper is employed, instead of 

 several separate pieces, it is often convenient to divide it by 

 lines, and tabulate each part separately, just as when separate 

 pieces of paper are used. 



Mode of Eecording Expeuiments. 



Exjjcriinent I, Koveiiiber 5, 18 — . 



Young rabbit. Weight 1540 grammes. Jugular vein, 

 •exposed and 1 cubic centimetre of tincture of opium, contain- 

 ing 2 grammes in 25 cubic centimetres, injected into it. 

 Cannula in the left carotid. Animal otherwise uninjured. 



