PHYSIOLOGY OF SMOOTH AND STRIATED MUSCLE 



567 



Experiment 66 

 April 10, 1912 

 Sartorius of leopard frog 61, weighed 

 fresh 0.192 gram 

 1.05 P.M. immersed in 1.3 per cent 



K2HPO4 solution 

 1.35 P.M. weighed 0.198 gram, fibers 

 not shortened, but en- 

 tirely unirritable 

 2.05 P.M. weighed 0.201 gram 

 2.35 P.M. weighed 0.203 gram 

 3.05 P.M. weighed 0.206 gram 

 3.35 P.M. fibers have about same 

 length as originally, trans- 

 ferred to Ringer 

 4.10 P.M. now quite irritable.^ 

 11.23 A.M. April nth, weighed 0.200 

 gram, now highly irritable 

 Temperature varied between 18° and 

 19° 



1 Ringer solution was not agitated 

 between 3.35 and 4.10 



Experiment 68 

 April 10, 1912 

 Sartorius of leopard frog 62, weighed 

 fresh 0.140 gram 

 1.20 P.M. immersed in Iper cent 



NaC2H302 solution 

 1.50 P.M. weighed 0.138 gram, fibers 

 markedly shortened, but 

 still somewhat irritable 

 2.20 P.M. weighed 0.145 gram 

 2.50 P.M. weighed 0.150 gram 

 3.20 P.M. weighed 0.150 gram, fibers 

 still shortened and some- 

 what irritable, have all 

 along been twitching more 

 or less rhythmically in the 

 solution 

 12.05 P.M. April 11, weighed 0.142 gram, 

 fibers still markedly short- 

 ened and entirely unirri- 

 table; transferred to 

 Ringer 

 1.40 P.M. now somewhat irritable 

 Temperature varied between 18° and 

 19° 



Experiment 67 

 April 10, 1912 

 Portion of stomach muscle of leopard 

 frog 61, weighed fresh 0.139 gram 

 1.15 P.M. immersed in 1.3 per cent 



K2HPO4 solution 

 1.45 P.M. weighed 0.141 gram, fibers 



little changed in length 

 2.15 p.m. weighed 0.144 gram, fibers 



slightly lengthened 

 2.45 p.m. weighed 0.145 gram, fibers 



still slightly lengthened 

 3.15 P.M. weighed 0.146 gram, fibers 



still slightly lengthened 

 3.45 P.M. still highly irritable 

 11 .45 A.M. April 11, weighed 0.167 gram, 

 fibers somewhat further 

 lengthened, and still fairly 

 irritable, though rather 

 less so than those of com- 

 panion of Experiment 65 

 which had been in 0.9 

 per cent KCl solution 

 Temperature varied between 18° and 

 19" 



Experiment 69 

 April 10, 1912 

 Portion of stomach muscle of leopard 

 frog 62, weighed fresh 0.157 gram 

 1.25 P.M. immersed in 1 per cent 



NaC2H302 solution 

 1.55 P.M. weighed 0.158 gram, fibers 



slightly lengthened 

 2.25 P.M. weighed 0.161 gram, fibers 

 somewhat further length 

 ened 

 2.55 P.M. weighed 0.162 gram, fibers 

 have about same length as 

 at last weighing 

 3.25 P.M. weighed 0.160 gram, fibers 

 slightly longer than at 

 2.55 

 3.55 P.M. still quite irritable 

 11 .55 A.M. April 11, weighed 0.165 gram, 

 fibers somewhat longer 

 than at 3.25 p.m. yester- 

 day, and still quite irri- 

 table 

 Temperature varied between 18° and 

 19° 



