. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 1960 MAM M AM A N 11IBER N ATION 117 served in non-hibernators after hypophysectomy. Suomalainen ( L938b, 1 !»4()), too, saw pre-hibernal involution of the cortex in hibernators. Later, however, Suomalainen (1954) concluded on the basis of his new observations thai the cortex of hedgehogs is hyperactive during cold seasons. The same author was able to confirm these findings in hamsters (Suomalainen ami Granstrom, 1955). lie concluded that the "alarm reaction" of Selye is present in hiliernators during cold m
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 1960 MAM M AM A N 11IBER N ATION 117 served in non-hibernators after hypophysectomy. Suomalainen ( L938b, 1 !»4()), too, saw pre-hibernal involution of the cortex in hibernators. Later, however, Suomalainen (1954) concluded on the basis of his new observations thai the cortex of hedgehogs is hyperactive during cold seasons. The same author was able to confirm these findings in hamsters (Suomalainen ami Granstrom, 1955). lie concluded that the "alarm reaction" of Selye is present in hiliernators during cold months. Zalesky and AVells (1940) also observed a well developed cortex in ground squir- rels exposed to the low environmental OCT. NOV. DEC. JAN. FEB. MAR. Fig. ~2. Survival time of adrenalectoniized ground squirrels during .-1111111111 spring period. From Popovic and Vidovic (19,31). Survival of summer-active hibernators after adrenalectomy is similar to that of non-hibernators. But during the winter, survival time of adrenalectoniized marmots (Britton, 1931; Brit- ton and Silvette, 1037) and of adrenalectoniized ground squir- rels (Popovic and Vidovic, 1951; Vidovic and Popovic, 1954) was much longer. This contrasts with the non-hibernators in which cold decreases the survival of adrenalectoniized animals. Figure 2 shows the survival of adrenalectoniized ground squir- rels during the cold months. This is similar to Kayser's graph (1952) showing the time spent in hibernation during the same. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
Size: 1991px × 1255px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
