Abstract
The oxygen consumption of eggs and larvae of Asterias forbesii and Arbacia punctulata was measured by the Warburg-Barcroft technique, in sea water, in sea water solutions of KCN (5 x 10-4 M) and methylene blue (0.002 per cent) and with atmospheres of carbon monoxide (99.5 per cent pure). Eight stages were studied: unfertilized and fertilized eggs, first cleavages, morula, blastula, early and late gastrula, and pluteus. Subsequent development after a period of two to three hours exposure to these reagents was followed in sea water.Methylene blue increased oxygen consumption most when acting on unfertilized eggs, did not increase it for gastrula, and increased it slightly in the other stages. When transferred to sea water, the effects of methylene blue persisted in increasing the rate of development of larvae, prolonged their life and produced larger plutei.Cyanide decreased oxygen consumption most strongly when acting on gastrulae, less so for other stages, and had little or no effect on unfertilized eggs....
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