[ * 0 * 3 
Experiment CL 
Mufcles which have been expofed to the 
action of the nitrous air, experience a lofs 
which may be calculated. 
Suppofe we take the pofterior extremi¬ 
ties of a frog and feparate them from each 
other—one is placed under a veflel of 
nitrous air, and the otjjer under one con- 
taining atmofpheric air. The former leg 
moves more weakly than the other, and 
lofes its- vitality more quickly ; it even 
ceafes to give marks of electricity when 
left too long under the glafs. 
Experiment C1L 
Having repeated the fame experiment 
with inflammable air, I was aware that it 
operated upon the mufcular fibre with lefs 
activity than the nitrous. 
* 
H 3 
Experi- 
