328 PROTOPLASMIC ACTION AND NERVOUS ACTION 



In the following table^ are collected a considerable 

 number of observations showing the rate of development 



Duration of Rising 



Phase of Action-Current 



Curve ((r = .ooi sec.) 



Tissue 



A. Striated Muscle: 



Frog's 

 gastrocnemius... 2.58+3.84 



B. 



Frog's 



gastrocnemius. 

 Frog's sartorius . 

 Frog's sartorius . 

 Frog's sartorius . 

 Frog's sartorius . 

 Frog's sartorius . 

 Frog's hyglossus. 

 Frog's hyglossus. 



Mammalian muscle 

 Rabbit's 



gastrocnemius. . . 



{ca. 20°) 



1. 1-3. 5 (ca. 20°) 

 1.6-3 2 (ca. 20°) 

 4.1-4.2 (8°) 

 2.4-2.9 (18°) 



13 (3°) 



5.8 (14.8°) 



20 (3°) 



8.9 (14.7°) 



ca. 2 (ca. 37°) 



Nerve :2 



Frog's sciatic 0.9-1.2 (ca. 18°) 



Frog's sciatic 0.55 (32°) 



Rabbit's sciatic. . . ca. 0.5 (32°) 



Dog's sciatic ca. 0.7 (36°) 



Velocity of Propagation 

 of Excitation- Wave 



ca. 3-4 met.-sec. 



ca. 1.2 met.-sec. (8°) 

 ca. 1.65 met.-sec (18°) 

 1.06 met.-sec. (3°) 

 1.65 met.-sec. (14.8°) 

 0.38 met.-sec. (3°) 

 ca. 0.96 met.-sec. 

 (14.7°) 



10-13 met.-sec. in 

 man's forearm 



20-40 met.-sec. at 20° 

 30-80 met.-sec. at 30° 

 ca. 100 met.-sec. at 37° 

 ca. 100 met.-sec. at 37° 



^ From my article, American Journal of Physiology (1914), loc. cit.; 

 the observations cited are from many different authors; for complete 

 references cf. this article. 



2 These observations were made with the thread galvanometer. 

 More recent work on vertebrate nerve with other methods indicates that 

 the rise is even more rapid. The rates shown by the recent work of 

 Gasser and Erlanger with the cathode ray oscillograph are almost double 

 those indicated by Garten's observations cited in the table. Cf, 

 American Journal of Physiology, LXII (1922), 517. See also the work 

 of R. Plant with a rheotome method; in the frog's sciatic the rise was 

 estimated at 0.2 to 0.30- (Z.fiir Biol., LXXVIII [1923], 133). 



