. The Biological bulletin. Biology; Zoology; Marine biology. PENETRATION OF DAYLIGHT INTO THE SEA 333 Table III and the curve for Series 122 is shown in Fig. 4. In this series measurements were made every meter to a depth of 16 meters. Since the water in the harbor is so rapidly changed by swift tidal cur- rents, considerable fluctuations in the amount of sediment present un- doubtedly occur. In Series 121 it was possible to measure the irra- diation with the photometer suspended so that its window was only a Percentage of Surface Light 1 5 10 50 100. Fig. 5. Relation between
. The Biological bulletin. Biology; Zoology; Marine biology. PENETRATION OF DAYLIGHT INTO THE SEA 333 Table III and the curve for Series 122 is shown in Fig. 4. In this series measurements were made every meter to a depth of 16 meters. Since the water in the harbor is so rapidly changed by swift tidal cur- rents, considerable fluctuations in the amount of sediment present un- doubtedly occur. In Series 121 it was possible to measure the irra- diation with the photometer suspended so that its window was only a Percentage of Surface Light 1 5 10 50 100. Fig. 5. Relation between depth and irradiation expressed in percentage of light just over the surface (logarithmic scale). The series shown (115 to 119) were all made at Station 1287 in the Gulf of Maine. The broken lines are merely to aid in distinguishing individual curves from each other in cases where they cross. few centimeters below the surface. The irradiation was found to be 84 per cent of that recorded a few centimeters above the surface. Two hours later when Series 122 was made, a gentle breeze had sprung up and it was not possible to make another measurement as near the sur- face as before. The transmissive exponent for the whole series was slightly increased, but the irradiation at one meter remained the same. Discussion A thorough review of the literature on the transmission of solar radiation through water has recently been made by Atkins (1932). Ac- cordingly, no systematic comparison of the work of previous investi- gators will be attempted in the present paper. However, the general relationship between observations reported here and comparable in- vestigations will be discussed 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Cl
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