Abstract
Contrasting surfaces, such as black panels with white borders do not appear to affect the number of barnacle larvae which become attached during a given time. The intensity of general illumination in the vicinity of the panels appears to have most influence upon attachments, which take place more readily under conditions of shading, below rather than above horizontal collectors, and on horizontal rather than vertical collectors. Greater numbers attach to black than to opal glass. The shading effect of black and opal panels is evident in the increase in attachments when larvae are placed at distances up to 6 inches behind vertical transparent collectors.

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