ANIMAL ELECTRICITY.— LIXTUKK III. 



75 



REFERENCES. 



A full account of the subject of this lecture is given in PJnl. 

 Trans, of the Royal Society for 1897 (Observations on 

 Isolated Nerve ; with Particular Reference to Carbon 

 Dioxide. Croonian Lecture for 1896). 



The " Staircase " phenomenon, first pointed out by Bowditch 

 as being characteristic of heart-muscle, and by Romanes 

 as occurring in the contractile tissue of Medusa, is con- 

 sidered by Romanes at some length from a general 

 standpoint in Jelly-FisJi and Star-Fish, International 

 Scientific Series, p. 54. 



The notion of " canalisation " or " Bahnung " is developed 

 by Herbert Spencer in the Principles of Psychology, and 

 alluded to by Romanes (loc. cit., p. 87), who gives 

 references to earlier statements in a similar sense by 

 Lamarck 



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