. 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

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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti