394 



ELECTRO- PHYSIOLOGY 



CHAP. 



TABLE I. NUMBER OF COLUMNS IN THE ELECTRICAL ORGANS 



OF DIFFERENT TORPEDINID^E 



TABLE II. NUMBER OF COLUMNS IN ONE ELECTRICAL ORGAN 



OF TORPEDINID.E 



From this it appears that the number of columns is not the 

 same on the dorsal and ventral surfaces, but varies to a consider- 

 able extent. It is questionable whether this is due to a free 

 ending of the columns within the organ (as is the case in Gym- 

 notus also). In the sense of the preformation theory, on the 

 other hand, the number of columns remains approximately equal, 

 with variations in the length of the organ of 37-128 mm. The 

 same appears from Babuchin's later calculations from a mother- 

 fish 42 cm. long, and 3 embryos of 10^- cm. long, with a gut 



