. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ACCOMMODATION TO OSMOTIC PRESSURES 373 widening bay into which the river empties is hemmed in by numerous islands and mainland points, and at low tide vast areas of exposed mud flats, ledges, and rocky shores furnish an ideal environment for many common marine invertebrates. With such a body of fresh water enter- ing the sea, it seemed reasonable to assume that there would be regular changes in the salt concentration with the tides, and that sessile forms of life would be subjected to rapid changes in the osmotic pressure of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ACCOMMODATION TO OSMOTIC PRESSURES 373 widening bay into which the river empties is hemmed in by numerous islands and mainland points, and at low tide vast areas of exposed mud flats, ledges, and rocky shores furnish an ideal environment for many common marine invertebrates. With such a body of fresh water enter- ing the sea, it seemed reasonable to assume that there would be regular changes in the salt concentration with the tides, and that sessile forms of life would be subjected to rapid changes in the osmotic pressure of the external medium in their natural environment. Freezing points were measured in a simple cryoscope by means of a Heidenhain thermometer. Samples were collected at 15 stations (see CHERRYFIELD. FIG. 1. Map of the lower portion of the Narraguagus River and of Narra- guagus Bay, showing points of collections. Station one is at head tide. Stippled areas represent mud flats exposed at low tide. Depths are at mean low tide. Average tide, 11 feet. After U. S. G. S. Cherryfield and Petit Manan quad- rangles. Fig. 1) in small air-tight jars having a capacity of ten cubic centimeters, and were tested in the laboratory after filtering within 48 hours. As can be seen in Table I, the freezing point values at high tide are lower than those at low tide at all points except station one. In general there is a greater depression of the freezing point towards the open sea, al- though some irregularities appear because of the contours of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983.
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