. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 502 BULLETIN: MI'SEl'M OK COMPARATIVE ZOOLOGY \'(>1. 124 Signs of heightened irritability and increased spontaneous activity are also soon in ground squirrels exposed to 5000 r or r. These signs are apparent for several days after irradia- tion both in animals placed at 5°C and 23°C. > Z> UJ o UJ 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 60 62 64 66 TIME (doys postirrad iation) Fig. I. The influence of X-radiation upon the mortality of bats in a 5J- --?, 60,000 r. All groups contained 4<» anima
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 502 BULLETIN: MI'SEl'M OK COMPARATIVE ZOOLOGY \'(>1. 124 Signs of heightened irritability and increased spontaneous activity are also soon in ground squirrels exposed to 5000 r or r. These signs are apparent for several days after irradia- tion both in animals placed at 5°C and 23°C. > Z> UJ o UJ 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 60 62 64 66 TIME (doys postirrad iation) Fig. I. The influence of X-radiation upon the mortality of bats in a 5J- --?, 60,000 r. All groups contained 4<» animals except for the one exposed to 60,000 r, which contained 12. It may be of interest to note that the later in the winter that bats are collected and irradiated, the greater the percentage of animals that fail to become dormant within the first two days of exposure to cold (Fig. 2). Data similar to those shown for 30,000 r in Figure 2 were also obtained in a series of experiments with 40,000 r as the radiation dosage. In yet another experiment, groups of 12 bats were exposed to 30,000 r in late March and kept at 23°C for 5, 10, or 24 hours before they were placed in a room at 5°C. All of these animals survived the stay at the higher temperature but died during the first 48 hours after being placed at 5°C. The indications that irradiation can disrupt the maintenance of hibernation have been confirmed in other experiments on the bat (Smith and Thomson, 1959) and ground squirrel (Smith, 1959a ). Prior to and early in the course of continuous x-irradia- tion, bats thai are hibernating at 5°C have a rectal temperature. 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
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