Abstract
1. The effects of oxygen tensions and carbon monoxide on the respiration of silkworm pupa (Bombyx mori L.) were studied.
2. In the cases of 1 and 7 days old pupae, normal oxygen consumptions were maintained until the oxygen tensions reached 10%, but in 5% and 1% oxygen tensions the respiratory rates were respectively 78% and 54% of the initial level.
3. Throughout the pural stage the respiration of silkworm pupa was considerably inhibited by carbon monoxide and the inhibition was photoreversible.
4. On the basis of this and other data, it was imagined that almost throughout the pupal stage cytochrome oxidase functioned as a principal terminal oxidase in the respiration of Bombyx pupa.
