Abstract
Three phases of heart activity and of general behavior follow administration to the silkworm of lethal doses of trivalent or of pentavalent arsenic: first, a period of vigorous, regular, and often, accelerated heart pulsations during which the larva is motionless; second, a period of more or less rapid decline in heart rate during which the larva squirms; third, a period of irregular pulsations and diminution in amplitude of beat during which squirming ceases.
Trivalent arsenic seems to differ in its effect from the same dose of pentavalent arsenic only in its greater speed of toxic action.
Footnotes
- Received April 15, 1926.
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