PHYSIOLOGY OF SMOOTH AND STRIATED MUSCLE 



561 



Experiment 47 

 February 24, 1911 

 Tendo Achillis of bull-frog 29, 

 weighed fresh 0.347 gram 

 10.20 A.M. immersed in Ringer at room 

 temperature (see below) 

 10.50 A.M. weighed 0.375 gram 

 11.50 A.M. weighed 0.398 gram 

 1.50 P.M. weighed 0.417 gram 

 4.50 P.M. weighed 0.422 gram 

 9.50 A.M. February 25, weighed 0.427 

 gram 

 Temperature varied between 20° and 

 22° 



Experiment 48 

 February 2^, 1911 

 Tendo Achillis of bull-frog 29, 

 weighed fresh 0.367 gram 

 10.22 A.M. immersed in Ringer at 1° 

 10.52 A.M. weighed 0.392 gram 

 11.52 A.M. weighed 0.410 gram 

 1.52 P.M. weighed 0.426 gram 

 4.52 P.M. weighed 0.437 gram 



Temperature up to this point varied 

 between 0° and 1° 



9.52 A.M. February 25, weighed 0.445 

 gram, temperature has 

 risen to 5.5° 



Experiment 49 

 March 3, 1911 

 Sartorius of bull-frog 30, weighed 

 fresh 0.171 gram 

 10.23 A.M. immersed in 9 per cent cane 



sugar solution 

 10.43 A.M. weighed 0.174 gram 

 11.03 A.M. weighed 0.171 gram 

 11.23 A.M. weighed 0.168 gram 

 12.23 P.M. weighed 0.164 gram, still 

 appears normal, but is en- 

 tirely unirritable, trans- 

 ferred to Ringer 

 12.55 P.M. now quite irritable 

 2.38 P.M. still quite irritable 

 Temperature varied between 18° and 

 20° 



Experiment 50 

 March 3, 1911 

 Portion of stomach muscle of bull- 

 frog 30, weighed fresh 0.220 gram 

 10.20 A.M. immersed in 9 per cent cane 



sugar solution 

 10.40 A.M. weighed 0.235 gram, "fibers 



somewhat lengthened 

 11.00 A.M. weighed 0.245 gram 

 11.20 A.M. weighed 0.259. gram 

 12.20 P.M. weighed 0.260 gram, fibers 

 only slightly longer than 

 at 10.40 A.M. still highly 

 irritable 

 Temperature varied between 18° and 

 20° 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 13, NO. 4 



