32 A CHEMICAL SIGN OF LIFE 
It appears from these determinations that the heart 
ganglion gives off about the same amount of carbon 
dioxide per gram of its substance as the nerve fibers of 
the same animal. Certainly there is no marked superi- 
ority of carbon dioxide output by the ganglion. If 
anything, its rate is a little lower. This is very in- 
teresting because, as already stated, this ganglion is 
TABLE IV 
SumMARY OF CARBON DroxipE PropucTIon FRoM Various NERVE TISSUES 
eee of 
Temper- 2 Given . 
Animal Sex Nerve ature | Off by 10 mg. Hotimated 
Degrees C.| of Nerve in y 
ro Minutes 
é wie cord of heart (30- 
Be) ecera esr asigs sede ay 23-23.5 | 4.7X10—7g.| Tashiro, 
Nerve. cata of heart (sr Adams 
Meshes aieiiecag beh eae 23 2.4X1077g.| Tashiro, 
3 Nerve cord of heart (52 Adams 
Limulus TUBS rays ach aiede sae ace an 23 2.3X1077g.| Tashiro, 
polyphemus Adams 
$ | Claw nerve............. 23 2.6X10~7 g.| Tashiro, 
Adams 
2 | Optic nerve, whole 17.8 | 2.6X1077g.| Tashiro 
2 | Optic nerve, proximal part 22.5 | 3.0X10~/g.| Tashiro 
@ | Optic nerve, distal part .. 22 Dakaall 7g.) Tashiro 
Claw nerve, whole 15-16 6. 7 X107—7 g.| Tashiro 
Claw nerve, whole....... 20.2 | 7.9X10~7g.| Tashiro, 
Adams 
Labinia Claw nerve, proximal part 21.4 | 8.0X10~7g.| Tashiro 
canaliculata Claw nerve, distal part... 23.2 | 3.7X1077g.| Tashiro 
Claw nerve, whole, when 
stimulated ........... 14-16 16.0X10~7g.| Tashiro 
ve Sciatic, resting .......... I9-20 5.5X107g.| Tashiro 
Rana pipiens { Sciatic, stimulated ...... 20-22 14.2X10~7g.| Tashiro 
automatically active all the time and is constantly dis- 
charging nervé impulses. Of course this result may 
be due either to an equality of the metabolism in cells 
and fibers, or the injury may have raised the rate more 
in the nerve than in the ganglion, or in the ganglion the 
amount of non-nervous tissue may be somewhat greater. 
than in the nerve trunk, so that the carbon dioxide pro- 
