518 LIVING TORPEDOS IN BERLIN. 



Thence we find, putting wi g = i, according to the formula 





- h o = 3 >:I 99, " ht = 5-342. 

 III. w ho = 3-655, ... w ho = 18-50. 



This very surprising result induced me to determine again the 

 resistance of frog muscle in comparison with the physiological rock- 

 salt solution, and on the same occasion, that of the artificial sea- 

 water of the Berlin aquarium, which had a specific gravity of 1-0250 

 at 22-75 C., and was thus apparently somewhat higher than on 

 the occasion of Prof. Christiani's determination of the conducting 

 power of sea- water 1 . This time 



i = 60-9 sc., iig = 48-0 sc., i m = 40-0, i gw = 56-5 sc., 

 whence resulted 



Mm = I'93 8 3> *w = 0-3202. 



I had previously (1871) found w m = 1-9045; the difference 

 amounts to -/ T ; a closer agreement is scarcely to be expected in 

 determinations of the kind. 



I undertook a second similar series of experiments on the 

 third Torpedo, on the second day of experimenting. I omit the 

 observed deflections, and give at once the values calculated from 

 them, that is to the specific resistances of three other preparations, 

 through which currents were led homodromously and heterodro- 

 mously. These exhibited powerful organ currents. Their specific 

 resistances are stated below in terms of that of physiological salt 

 solution : 



IV - .* = 3-5983, -.. w. = I3-55I7. 



V - W HO = 3-3741, ....= 6-2752. 



VI. v> ko = 3-7781, ... w he = 6-2752. 



On the same occasion, I determined the resistance of the tap- 

 water wi w at 37*955- It was interesting to consider how these 

 determinations of sea- and tap-water would agree with those 

 obtained by Prof. Christiani by another method, and which are 



1 Untersuchungen, &c., p. 413. 



