¹ From the Zoological Laboratory, Harvard University, Cambridge.

1. A modified Osterhout respiratory apparatus for the detection of CO₂ from nerve is described.

2. The lateral-line nerve from the dogfish discharges CO₂ at first with a gush for half an hour or so and then steadily at a lower rate for several hours.

3. Simple handling of the nerve does not increase the output of CO₂; cutting it revives gush.

4. The CO₂ produced by nerve is not escaping simply from a reservoir but is a true nervous metabolite.

5. The rate of discharge of CO₂ from a quiescent nerve varied from 0.0071 to 0.0128 mg. per gram of nerve per minute and averaged 0.0095 mg.

6. Stimulated nerve showed an increased rate of CO₂ production of 15.8 percent over that of quiescent nerve.

7. The results of these studies indicate that chemical change is a factor in nerve transmission.

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