EFFECT OF IRRITATION OF A POLARIZED NERVE. 



381 



Time. 



Number of ex- 

 pci'imeut. 



7i. m. 



10 50 : 5tb irritations . 



53 6th iiTitations . 



57 7tb irritations. . 



58 8tb irritations. . 

 1105 9tb iiritations. . 



OC luthirritaiions. 



07 11th irritations. 



73. 



11 15 1st irritations. 



12 00 j 2d irritations.. 

 00-J- 3d irritations.. 

 01 i 4tb irritations. 

 OIJ: 5th irritations 

 07'l Cth irritations. 

 08 7th irritations. 



4 15 

 17 

 20 

 21 

 22 

 23 

 50 



3 06 



08 



74. 



1st irritations 

 2diiTitations.- 

 3d irritations.. 

 4th irritations 

 5th iriitations . 

 6th irritations. 

 7th irritations 



Irritation without 

 polarization. 



Initaf ion during 

 polarization. 



75. 



1st irritations. 



2d irritations.. 



10 j 3d iiritations.- 



15 ' 4th irritations - 



16 5th iriitations 

 16-1' Otb irritations. 

 20 ; 7th irritations 



1847 cent 1. 



2016ci-nt 1. 



2.)C2 cent 0. 5 



2618 cent 0.5 



2728 cent .... 0.5 



2618 cent 0.5 



2618 cent 0.5 



Irritation, 1 cell, rheo. 

 cbcrd: 



1526 cent 0.5 



888 cent 2. 



888 cent- 2. 



888 cent 2. 



888 cent 2. 



888 cent .... 0.5 

 888 cent 1. 



Irritation, 1 cell, rbeo- 

 cbord : 



1057 cent 0. 5 



1957 cent 0. 5 



341 cent a. 



1214 cent 5. 



1214 cent 5. 



1214 cent 5. 



2016 cent 2. 



Irritation, 1 cell, rheo- 

 chord : 



3003 cent 0. 2 



3003 cent 0. 



3003 cent 0.5 



27S1 cent 2. 



2781 cent 0. 



2781 cent 0. 



2781 cent 1. 



50 cent 2. 



55 cent 2. 



55 cent 1. 



55 cent 1. 



10 cent 1. 



10 cent 1. 



55 cent 1. 5 



Polarization, 1 cell, 

 rheochord: 



49 cent 1. 



10 cent 3. 



40 cent 3. 



49 cent 3. 



10 cent 3. 



49 cent 0.2 



10 cent 0.2 



Polarization, 1 cell, 

 rheochord : 



50 cent 1. 5 



10 cent 0.5 



10 cent .5. 



50 cent 5. 



10 cent 5. 



10 cent 5. 



49 cent 3. 



Polarization, 1 cell, 

 rheochord : 



10 cent 3. 



55 cent 3. 



55 cent 2. 



55 cent 3. 



10 cent 3. 



55 cent 3. 



55 cent 2. 



Remarks. 



Kana temporaria. 



Rana temporaria. 



Eana temporaria. 



In four of these exiieriments the polarizing current usually produced 

 an increased excitability of the nerve to the side of the negative pole ; 

 while in two experiments the polarization seemed to have little or no 

 influence on the efiect of the irritating current. 



A "half-saturated" solution of pure chloride of sodium was now sub- 

 stituted for the irritating current and the experiment repeated in this 

 manner. The solution was applied to the nerve near the muscle and 

 5™'" below the point of application of the descending polarizing current. 



Experiment 7G. — Sciatic nerve and gastrocnemius muscle of a Rana 

 esculenta. 



Polarizing current from 1 Daniel. 



First irritations. — Salt solutiou alone ^1. Witli polarization, 3. 

 Second irritations. — Salt solution alone^l. "With polarization, 

 Third irritations. — Salt solution alonc^l. With polarization, 0. 

 Fourth irritations. — Salt sohition alone=l. With polarization, 0. 

 Fifth irritations.— Salt solution alone=:l. With polarization, 0. 

 Sixth irritations. — Salt solution alone = l. With polarization, 0. 

 Seventh irritations. — Salt solutiou aloue=l. With polarization, 0. 



