. Annals of the New York Academy of Sciences. Science. SCOTT, STUDY OF CHANGES IN MUSTELUS CAN IS 57 in intensity and frequency until nearly an hour after immersion, and then gradually and irregularly declined in number and strength. These respiratory movements are possibly modifications of increased intensity of the normal gill-cleaning movements mentioned above. It is also pos- sible that both have fundamentally the same cause but that the stimulus is more intense when the fish is immersed in fresh water. Foreign ma- tM:'^-:;!.:'|ri,. Fig. 11.—Showing the change in the character of the respi
. Annals of the New York Academy of Sciences. Science. SCOTT, STUDY OF CHANGES IN MUSTELUS CAN IS 57 in intensity and frequency until nearly an hour after immersion, and then gradually and irregularly declined in number and strength. These respiratory movements are possibly modifications of increased intensity of the normal gill-cleaning movements mentioned above. It is also pos- sible that both have fundamentally the same cause but that the stimulus is more intense when the fish is immersed in fresh water. Foreign ma- tM:'^-:;!.:'|ri,. Fig. 11.—Showing the change in the character of the respirations during an hour after immersion of Mustelus in fresh tcater. Irregularities represent spasmodic respira- tory movements. terial on the surfaces of the gill membranes prevents the normal func- tioning of these structures and tends toward asphyxiation. The changes in the gill membranes brought about by immersion of the fish in fresh water are accompanied by the same convulsive gill movements. There is considerable variation in the respiratory modifications in individuals, but the above mentioned features were observable in most. 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 New York Academy of Sciences. New York, New York Academy of Sciences
Size: 1509px × 1657px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
