24 Colorado College Studies. 



bandage was used to wind the arm, beginning with the fingers, 

 8o that the blood was all driven back to a point near the 

 shoulder. A lighter weight was then used, 175 grams at 

 first, since the hand was rendered partially numb by the ex- 

 periment. The effect was not all that we hoped but showed 

 one or two noteworthy results. Since the winding occupied 

 one or two minutes, the hand was rapidly cooling before the 

 curve began. It was interesting, therefore, to note that the 

 first curve with each subject, taken with a bloodless arm, was 

 a facsimile of his normal curve taken with the blood in the 

 muscle. This was especially noticeable with one subject 

 whose curve was very characteristic, always having a rally 

 at a certain point near the finish. This rally appeared just 

 the same when the blood was shut off. Knowing one's curve 

 before, the curve with the bloodless arm could be identified 

 easily. After the first curve was taken and the weight could 

 not be moved again, the weight was taken off and three 

 minutes given for exercise of the muscle and warming up. 

 Then the same weight was attached. At first in each case it 

 could not be moved. Then with G. the power came back 

 and the weight was raised, and for a time his characteristic 

 warmed-up curve was recorded, which curve always difPered 

 from the curve taken before the warming up. The pain in 

 the arm and hand became so severe that he begged to be 

 released. See curve No. 18, Plate 4. A recovery of power was 

 found with other subjects but not very marked except in one 

 case where a nearly normal power was gained for a few sec- 

 onds, but the violent pain and numbness rendered the hand 

 useless. Sometimes after the first curve and five minutes' 

 attempt at warming up the hand could not be opened or 

 shut and no motion of the index was possible. After one 

 experiment with G., when the bloodless hand had become 

 useless and no curve was possible after the five-minute rest 

 following the first curve, the bandage was removed and in one 

 minute the curve was taken and the usual warmed up curve 

 was the result. This shows that the warming had occurred 

 but the hand was stiff and cold so that the effect could not 

 be registered. 



