Abstract
1. The capacity of the sea-urchin egg to shrink in hypertonic sea-water undergoes some cyclical variations during the period from insemination up to the first cleavage. 2. Whether shrinkage of the egg in hypertonic solution appears or not, can not serve as an absolute indicator of its osmotic behavior. 3. Shrinkage of the egg in hypertonic sea-water depends not only on its permeability to water or salts but also on some colloidal properties of its ectoplasm which sometimes may obscure the purely osmotic effect. 4. Colloids of the egg-ectoplasm may be influenced largely by excess of ions contained in sea-water and the susceptibility of the egg-colloids to their action should undergo the same rhythmical variations as other physico-chemical properties of the egg.
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