. Animal life as affected by the natural conditions of existence. Animal ecology. EFFECTS OF HEDUCTION OF HEAT. 10? animal functions. Eossbach proved that the rhythmical con- tractions of the contractile vesicle in Infusoria are very'remark- ably aifected by a low temperature. He found by very carefully conducted experiments (fig. 27) that the pulsations of these vesicles were generally carried on most regularly and rapidly in a tempe- rature varying between 15° and 25° centigrade. But the lower-. Fio. 28.—Tlie Infusoria observed by Bossbach, a, CJdlodon cuaillulua; i, Eupkles Charon; c, Stylo
. Animal life as affected by the natural conditions of existence. Animal ecology. EFFECTS OF HEDUCTION OF HEAT. 10? animal functions. Eossbach proved that the rhythmical con- tractions of the contractile vesicle in Infusoria are very'remark- ably aifected by a low temperature. He found by very carefully conducted experiments (fig. 27) that the pulsations of these vesicles were generally carried on most regularly and rapidly in a tempe- rature varying between 15° and 25° centigrade. But the lower-. Fio. 28.—Tlie Infusoria observed by Bossbach, a, CJdlodon cuaillulua; i, Eupkles Charon; c, Stylonychia puslulata. Highly magnified. ing of the temperature to 5° above freezing point (5° centigrade) has a quite different effect on the different species ; thus, at this low temperature the vesicle of Ghilodon cucuUulua contracts seven times in a minute, that of Stylonychia pustulata only three times, while at 15° there are fifteen pulsations per minute in each. At 10° above zero * the length of one pulsation in * Zero, in the centigrade thermometer, is freezing point; 100° the boiling point of water at 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 Semper, C. (Carl), 1832-1893. New York, D. Appleton
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishernewyo, bookyear1881
