. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. ')>)•) BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY Vol. 124 60t . |.3 beats/mm I 2 50 JD c o> | -Q £404 30 \ tt I u ,1 4 beats/min. 6 7' II 12 I Noon 2 3 4 5 6 7' ^ Hi (Ml 1 ! 4 5 6 II 12 I 2 3 Midnight Fig. 9. Consecutive heart beat intervals of ground squirrel in hibernation. This analysis was made to reveal a 24-hour rhythm in heart beat regularity. There was no apparent difference between day and night readings. Like- wise, the mean heart rate was unvarying over 24 I2M 6 8 10 12 2 4 6 8 10 12 2 4 6 8 10
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. ')>)•) BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY Vol. 124 60t . |.3 beats/mm I 2 50 JD c o> | -Q £404 30 \ tt I u ,1 4 beats/min. 6 7' II 12 I Noon 2 3 4 5 6 7' ^ Hi (Ml 1 ! 4 5 6 II 12 I 2 3 Midnight Fig. 9. Consecutive heart beat intervals of ground squirrel in hibernation. This analysis was made to reveal a 24-hour rhythm in heart beat regularity. There was no apparent difference between day and night readings. Like- wise, the mean heart rate was unvarying over 24 I2M 6 8 10 12 2 4 6 8 10 12 2 4 6 8 10 12 2 4 6 8 10 12 Noon Midnight Noon Midnight Fig. LO. .Spontaneous partial rewarining (Day VII) from hibernation. This animal was studied for eight consecutive days, using skin temperature as an index to reveal day-night differences. For five days the temperature index showed a constant level of hibernation. There was one partial re- wanning, during which the animal did not awaken from hibernation. Visual observations were made prior to temperature records on Day VII. No heart rates were 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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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
