. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 3,4 DISCOVERY REPORTS surface; a feat which they accomplish by extruding a bubble of air through the pore of the float. In a few minutes the gas regenerates and then the animals rise to the surface'. A. Agassiz (1883) had already observed a young specimen of about 6 mm. 'swimming at various levels in the jar in which it was kept'. Miss Eleanor Dodge, writing from Miami, has kindly informed me that she has talked with people who have caught Physalia in plankton nets with their floats empty, but s
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 3,4 DISCOVERY REPORTS surface; a feat which they accomplish by extruding a bubble of air through the pore of the float. In a few minutes the gas regenerates and then the animals rise to the surface'. A. Agassiz (1883) had already observed a young specimen of about 6 mm. 'swimming at various levels in the jar in which it was kept'. Miss Eleanor Dodge, writing from Miami, has kindly informed me that she has talked with people who have caught Physalia in plankton nets with their floats empty, but she did not refer to their size; it looks as if they must have been small, perhaps larval stages. »/HAECKEL) -IOO (HAECKEL) /» / / / / / /*CQUATREFAGES). FLOAT- LENGTH (HAECKEL) (KISCH" Text-fig. 4. Physalia physalis. The relation between the diameter of the gas-gland and the length of the float. My companion at Lanzarote, George Mackie, made some experiments by withdrawing measured quantities of air from the pneumatocyst with a hypodermic syringe, but there was little subsequent change of volume. Quatrefages seems to have been the first to have analysed the contents of the pneumatocyst; his results are given in Table 5: Table 5 Percentage of Specimen Gas () 0 N co2 1 45 177 822 0 2 72 17-2 827 0. 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 Institute of Oceanographic Sciences (Great Britain); National Institute of Oceanography of Great Britain; Great Britain. Colonial Office. Discovery Committee. London ; New York : Cambridge University Press
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