EL Kalstern 1954 Critical maximum temps. Bufo boreas and B. canorus Oct. 4 Expt #2 (cont.) 5.10+ canorus removed ad cloacal maximum taken 38.6°C. it regained righting reflex within 30-40 seconds and assumed upright stance 5:12 boreas cloacal temp. (max.) 38.7°C. it remained in the warm jar longer and was in deeper shock. Placed on paper towel, ad it righted itself within a minute, walked within 3 minutes. Also regained extended appearance of mid-body region. While in state of heat shock, it had appeared shrunken. Since boreas had been inactive for several minutes near the end of the experiment, it is hard to determine just when it went into shock. Both toady became active before losing their mobility about at the same time. Cloacal temps. are probably close to critical maximum this experiment. No significant difference between the two species, although boreas again may have gone into heat shock at a lower temperature than canorus Results Expt. #2: Critical maximum B. boreas and B. canorus 38-39°C. *note boreas relatively stunted condition compared to canorus. Former kept alive in Yosemite museum since quovison & received food half of summer.