. The Biological bulletin. Biology; Zoology; Marine biology. DEVELOPMENTAL RATE AND TEMPERATURE 77 portional to the temperature. Support for this view has been ob- tained by a number of investigators, and recently Ephrussi (1933) has shown that the effect of temperature on the rate of cleavage of sea- urchin eggs is fairly well expressed by it. In Fig. 4 the data of Table XII are plotted as the reciprocal of the time for first cleavage against the temperature. The points fall fairly well on a straight line for most of the temperature range, as they should if the rate is directly proportional t
. The Biological bulletin. Biology; Zoology; Marine biology. DEVELOPMENTAL RATE AND TEMPERATURE 77 portional to the temperature. Support for this view has been ob- tained by a number of investigators, and recently Ephrussi (1933) has shown that the effect of temperature on the rate of cleavage of sea- urchin eggs is fairly well expressed by it. In Fig. 4 the data of Table XII are plotted as the reciprocal of the time for first cleavage against the temperature. The points fall fairly well on a straight line for most of the temperature range, as they should if the rate is directly proportional to the temperature. At the lower temperatures devia- tions occur in the graphs for Dendraster and Urechis. The graph for Ciona, the data for which are more reliable than in the case of the other forms, is a very good straight line. ^. '"" Temperature (CENT.) '=" "="" Fig. 4. First cleavage data of Table XII plotted as rate against centigrade temperature. The significance of this linear relation between the rate of a bio- logical process and temperature is quite obscure. Belehradek employs a modified equation which may be written V = a {t — aY in which v is the velocity, t the temperature and a, a and h constants. When the exponent h = \, this becomes the linear relation. It is assumed that the temperature coefficients give a measure of the rela- tive viscosity although just how the constants of the formula are. 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 Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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