The electrical phenomena accompanying secretion. 



I L'i I 



was not nearly so viscid as that usually obtained by excitation of the 

 chorda in the cat. 



The following - experiment is a more typical one as it exemplifies 

 the variation usually obtained. In it we see stimulation of the chorda 

 producing at first an ordinary first phase (outer surface negative) and 

 giving an abundant and rather watery secretion, subsequently the 

 amount of the first phase diminished at the same time that a second 

 phase appeared; the saliva also had become distinctly more viscid and 

 less abundant. After a very small dose of atropine the first phase 

 was entirely abolished, and the secretion was diminished in amount 

 and viscid; subsequently after a further dose of atropine, the second 

 phase although not abolished was considerably diminished, and the 

 secretion altogether stopped. 



Cat. July 17. 1885. 



Time 



Resting 



Sign 

 of 



current 



Relative 

 difference 



Nerve 



Distance 



of 

 secondary 



Sign of outer 



surface and 



galvanometer 



deflection 



Saliva 





outer 



of 





coil 



Pri- 



Secon- 







surface 



potential 







mary 



dary 





4 p. m. 



+ 



133 



chorda 



90 mm 



-360 





watery 



4.1 



+ 



90 



>> 



90 „ 



— 300 





n 



4.7 



+ 



20 



5> 



90 „ 



— 100 





ft 



4.9 

 4.15 



+ 



4 





90 „ 



90 „ 



— 150 



— 50 



+ 100 

 + 180 



At first watery 

 \ then viscid and 



4.20 



— 



9 



» 



90 ,, 



- 60 



+ 50 



less abundant 



4.28 



— • 



41 



>J 



90 „ 



— 40 



+ 100 



viscid 1 drop 



4.40 





Atropine (2 millij 



jrams) injected into pleura 



1 cavity 



4.44 

 4.47 







chorda 



J5 



60 mm 

 60 „ 



+ 40 

 + 200 



> very viscid 1 drop 



4.50 





Atropine (8 milli 



grams) injected into pleurs 



l1 cavity 



4.54 







chorda 



10 mm 



+ 



50 



no secretion 



Thus when the secretion was abundant there was a large first 

 phase, when the . secretion was less in amount this phase also was 

 lessened and a second phase appeared, finally, when the secretion had 

 been abolished by atropine, the second phase was still present, although 



Internationale Monatsschrift für Anat. u. Phys. IV. 9 



