250 



EXPERIMENTAL PHARMACOLOGY 



condition in which this procedure might be of help in re- 

 viving 1 an animal '? Try this on the next animal you have in 

 which the respiration ceases, especially if the blood-pres- 

 sure remains fairly high. 



Adjust all writing points, allow the animal to return to 

 normal (keeping the anesthesia as regular as possible) and 



Drop 



Metal plate 



--Hatfeck - 



Fig. 228. Arrangement of two tambours to form a drop recorder. 



wait ten or twenty minutes to record the normal rate of 

 urine flow. When this is obtained (not a drop of urim- 

 may have been secreted during this period, in which case 

 simply watch for the flow to start up) then proceed to give 

 the caffeine. Watch for the effect on respiration and the 

 circulation. Inject one cubic centimeter of caffeine.. What 

 do you observe? Increase the dose if the animal will 



