Abstract
Suspensions of sea urchin embryos spread over the surface of glass slides were attached to the glass by a rapid coagulation of the surface with alcohol. This was done either by dipping the glass slides into absolute alcohol or by a short exposure to alcohol vapor. Thereafter the slides were immediately transferred to the fixative. A suitable procedure includes fixation with Carnoy's fluid (alcohol, chloroform, acetic acid; 6:3:1) and staining with Gomori's hematoxylin after acid hydrolysis.
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