Carbon Dioxide From Nerve Fibres 



129 



experimented with two different apparati, the respiratory chambers 

 of which have had entirely different capacities. 38 



Comparison between the Metabolism of Resting Nerves and that 

 of Other Tissues. To compare the rate of metabolism of the nerve 

 with that of other tissues is a matter of no great physiological value 

 on account of great variations which do not affect equally the rate 

 of CO 2 production. Simply to give a better picture of the scope of 

 nervous metabolism, however, let us make the following comparison: 

 Since there is no exact determinations made on either the other organs, 

 or the whole animal, in the case of the spider crab, I have quoted those 

 of the nearest Crustacea of which data are available. (Table IX). 



TABLE IX 



- All the figures are quoted from Schafer's Text Book of Physiology i, pp. 702, 707 and 

 708, except that of the isolated muscle which I calculated from Fletcher (toe. a/.). Fletcher 

 fails to state the weight of a leg, but gives the value .2 c.c. for one-half hour. Hill believes 

 that if we take each leg 6 g. in average, the value will not be far from the truth. 



2 Fletcher fails to state the species of the frog, but it is inferred from Hill s paper. 



38 See the last columns of Table I and Table II. 



