PHYSIOLOGY OF SMOOTH AND STRIATED MUSCLE 



555 



Experiment 23 

 January 19, 1911 

 Cardiac half of stomach muscle of 

 leopard frog 18, weighed fresh 0.044 

 gram 



2.05 p.M immersed in Ringer without 

 NaHCOs + 0.025 per cent 

 lactic acid 

 2.35 P.M. weighed 0.044 gram, fibers 



somewhat lengthened 

 3.05 P.M. weighed 0.042 gram, still 



highly irritable 

 4.05 P.M. weighed 0.042 gram, only 



very slightly irritable 

 10.05 A.M. January 20, weighed 0.047 

 gram, shows small but de- 

 cided tendency to length- 

 en on stimulation/ fibers 

 not much changed in 

 length since 2.35 p.m. yes- 

 terday 

 Temperature varied between 18° and 

 21° 



Experiment 24 

 January 19, 1911 

 Pyloric half of stomach muscle of 

 leopard frog 18, weighed fresh 0.055 gram 

 2.00 p.m. immersed in Ringer without 

 NaHCOs + 0.05 per cent 

 lactic acid 

 2.30 p.m. weighed 0.059 gram, fibers 

 somewhat lengthened and 

 still highly irritable 

 3.00 p.m. weighed 0.059 gram, still 



highly irritable 

 4.00 p.m. weighed 0.060 gram, no 

 longer irritable; shows no 

 tendency to lengthen on 

 stimulation 

 10.00 a.m. January 20, weighed 0.067 

 gram, fibers still some- 

 "what lengthened (about 

 30 per cent longer than 

 those of cardiac half), and 

 entirely unirritable 

 Temperature varied between 18° and 

 21° 



» See p. 509. 



Experiment 25 

 January 23, 1911 

 Piece of stomach muscle of bull-frog 19, weighed fresh 0.375 gram 

 5.00 P.M. immersed in 7.5 per cent cane sugar solution at 7° 

 5.30 P.M. weighed 0.423 gram 



10.30 A.M. January 24, weighed 0.467 gram, fibers somewhat lengthened 

 11.30 A.M. weighed 0.518 gram 



4.30 P.M. weighed 0.622 gram, fibers now much lengthened 

 10.30 A.M. January 26, weighed 0.598 gram, fibers still much lengthened and still 



quite irritable 

 11.00 A.M. January 27, muscle still barely irritable 

 11.10 A.M. immersed in Ringer 

 5.10 P.M. muscle now no longer irritable 

 Temperature during this whole experiment varied between 5° and 9° 



Experiment 26 

 January 26, 1911 

 Sartorius of large bull-frog 20, ^ weighed fresh 0.692 gram 

 5.20 p.m. immersed in Ringer 

 6.20 p.m. weighed 0.694 gram 



10.20 A.M. January 27, weighed 0.704 gram, still highly irritable 

 10.25 A.M. January 28, weighed 0.725 gram. Rigor is fairly well started though 

 fibers are still somewhat irritable, particularly toward knee-end 

 Temperature varied between 19° and 22° 

 1 This frog weighed over 150 grams 



