. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 390 BULLETIN : MUSEUM OP COMPARATIVE ZOOLOGY Vol. 124 at 37°C was judged to be the beta. Only in animals which have just entered hibernation was it possible to obtain clear-cut re- sponses from the slower fibers. Although a beta spike could be seen iu nerves from other groups, it was too close to the alpha spike to be accurately measured. 100- 80 o UJ to 60 o o > 20 CTN 911-22-57 15 DAYS TOTAL HIB. 15 20 25 30 TEMPERATURE IN °C 40 Fi}>'. 1. Conduction velocity as a function of temperature. Both alpha (upper grou
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 390 BULLETIN : MUSEUM OP COMPARATIVE ZOOLOGY Vol. 124 at 37°C was judged to be the beta. Only in animals which have just entered hibernation was it possible to obtain clear-cut re- sponses from the slower fibers. Although a beta spike could be seen iu nerves from other groups, it was too close to the alpha spike to be accurately measured. 100- 80 o UJ to 60 o o > 20 CTN 911-22-57 15 DAYS TOTAL HIB. 15 20 25 30 TEMPERATURE IN °C 40 Fi}>'. 1. Conduction velocity as a function of temperature. Both alpha (upper group) anil beta (lower group) components ait- shown. Tins run is an example of an animal in the transitional stage. Figure 2 demonstrates the stability of the isolated nerve preparation by comparing measurements made at 2, 9, 24, 48 and 72 hours after decapitation. There was excellent repro- ducibility over this entire period, during which the nerve was held at 5°C, with, however, some decrease in excitability even after 24 hours. The two parameters describing a linear function are the slope (dV/dT) and the intercept (at V=0). The average values for these conduction-velocity increments and intercepts in the several groups of animals are tabulated in Table I and plotted in Figure 3. It may be seen that the conduction-velocity increment for the active animal is considerably greater and the intercept is higher than for the hibernating animal. The intercept values for the active ground squirrels are the same as those noted by Chat- field et til. (1948) for the hamster. The slopes appear to lie of. 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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