EFFECTS OF CENTRIFUGAL FORCE ON FERTILIZED EGGS OF ARBACIA PUNCTULATA AS OBSERVED WITH THE CENTRIFUGE-MICROSCOPE

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Abstract
Fertilized eggs, during rotation with the Harvey-Loomis centrifuge-microscope, show marked differences from unfertilized eggs and also characteristic behavior at various stages after fertilization. The greater elongation and greater ease of pulling apart of the fertilized eggs are connected with surface changes rather than viscosity changes since fertilized eggs at all stages stratify less readily than unfertilized. Eggs may be broken in 2 parts inside the fertilization membrane and one or both parts may develop or the 2 parts may subsequently fuse. Parthenogenetic eggs react like fertilized eggs. Eggs may cleave during rotation at high speeds.

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