Local Anesthesiaby Injections of Sterile Water.

Abstract

The color and spectroscopic appearance of this mixture are quite distinct from those of ordinary methemo¬ globin. Amyl nitrite in excess causes further changes, a body apparently identical with photohemoglobin be¬ ing formed."10 The similarity of the action of the nitrites and the fumes of smokeless powders is graphically shown in the appended tracings, Nos. 4, 5, 6 and 7. These rep-Tracing 4.-Normal rate, 70. Tracing 5.-Amyl nitrite. Rate, 115. Tracing 6.-Powder fumes. Rate, 112. Tracing 7.-Nitroglycerin, gr. 1/100 hypodermically. Rate, 110.