ANIMAL KLKCTRIdT\. LKCTURE III. "] ^iy 



Postscript, — The dubious tone of the remarks 

 made on p. 62, arose from the fact that the rehearsal 

 experiments carried out during the week preceding- 

 the lecture were so unsatisfactory that I abandoned 

 all hope of obtaining any clear demonstration of the 

 principal experiment. The nerves persistently said 

 *' check," giving only a very small augmentation of 

 response in consequence of prolonged tetanisation, 

 so small indeed as to be liable to escape detection 

 on the demonstrating galvanometer, except to very 

 close scrutiny. For this reason a recording galvano- 

 meter was put up in a dark room behind the lecture 

 theatre, in circuit with the demonstrating galvano- 

 meter (as shown in fig. 10), so as to have a record 

 of the experiment actually made, to be put into the 

 witness-box at the end of the lecture. 



As it turned out, however, the lecture experiment 

 came out with remarkable distinctness ; the response, 

 after prolonged tetanisation (ten minutes), appeared 

 to be about three times as great as before, and the 

 photographic record was subsequently brought in as 

 a somewhat superfluous piece of evidence. 



This result, which was more surprising to the 

 lecturer than to any of his audience, had been secured 

 by Miss Sowton, who acted as lecture-assistant, and 

 arose as follows : — 



From previous experiments made in order to test 

 the possible nutritive action upon nerve of proteids 

 and of carbohydrates, we had found that lactose, among 



