PHYSIOLOGY OF SMOOTH AND STRIATED MUSCLE 



569 



Experiment 72 

 April 16, 1912 

 Sartorius of leopard frog 6,^ weighed 

 fresh 0.139 gram 

 11.00 A.M. immersed in 0.9 per cent 



KCl solution 

 11.30 A.M. weighed 0.157 gram 

 12.00 M. weighed 0.178 gram 

 12.30 P.M. weighed 0.182 gram 

 1.00 P.M. weighed 0.195 gram 

 5.00 P.M. weighed 0.273 gram, fibers 

 not shortened, entirely 

 unirritable, temperature 

 up to this point had varied 

 between 20° and 21°; mus- 

 cle transferred to Ringer 

 at 12^ 

 9.30 A.M. April 17, still entirely unir- 

 ritable, fibers little short- 

 ened, temperature since 

 5.00 P.M. April 16 has 

 remained at 12°, now al- 

 lowed to rise to 19° 

 10.30 A.M. fibers now considerably 



shortened 

 4.10 P.M. fibers still shortened and en- 

 tirely unirritable, temper- 

 ature has remained since 

 10.30 A.M. at 19° 



Experiment 73 

 April 16, 1912 

 Stomach muscle from leopard frog 



63,- weighed fresh 0.241 gram 



11.10 A.M. immersed in 0.9 per cent 

 KCl solution 



11.40 A.M. weighed 0.224 gram, fibers 

 somewhat shortened 



12.10 P.M. weighed 0.227 gram, fibers 

 still shortened 



12.40 P.M. weighed 0.237 gram, fibers 

 still shortened 

 1.10 P.M. weighed 0.249 gram, fibers 

 very slightly longer than 

 at last weighing 

 4.10 P.M. weighed 0.283 gram, fibers 

 somewhat longer than at 

 1.10 



11.10 A.M. April 17, weighed 0.372 

 gram, fibers now much 

 lengthened, still some- 

 what irritable, though lat- 

 ent period is long 

 Temperature varied between 19° and 



21° 



^ This frog's tissues were somewhat 

 oedematous 



' This frog's tissues were somewhat 

 oedematous 



Experiment 74 



April 18, 1912 

 Sartorius from sjnall bull-frog 64, weighed fresh 0.195 gram 

 10.20 A.M. immersed in 0.9 per cent KCl solution 

 11.20 A.M. weighed 0.213 gram, fibers not changed in length 



12.20 pjvr. weighed 0.235 gram, muscle still has original length and is rather stiff 

 and gelatinous 

 1.20 p.m. weighed 0.255 gram, entirely unirritable, transferred to Ringer 

 2.20 P.M. still entirely unirritable; fibers not changed in length 

 3.20 P.M. now somewhat irritable, particularly at thin lower end; Ringer solu- 

 tion has been agitated a good deal between 1.20 and 3.20 

 4.20 P.M. now quite irritable 



9.40 A.M. April 19, weighed 0.192 gram, now highly irritable through whole extent 

 to mechanical as well as electrical stimulation, not shortened and 

 shows no sign of rigor 

 Temperature throughout this experiment was 16° 



