32 GEOEGB JOHN EOMANBS 1875- 



during contraction in the way you suggest — at least 

 not with Sarsia ; but I intend to try with some of 

 the larger Medusse. 



Some apparatus is coming from Cambridge to 

 enable me to test for electrotonus and Pfliiger's law. 

 I shall apply it to the luminous Medusse also, whose 

 light, I forgot to say, is seen under the micro- 

 scope in the dark to proceed not only from the 

 margin alone, but from that particular part of the 

 margin where Agassiz describes his chain of nervous 

 cells. 



Geo. J. KoMANEs. 



From C. Dai-win to G. J. Romanes. 



Down, Beckenham, Kent : July 18, 1875. 



I have been much interested by your letter, and 

 am truly delighted at the prospect of success. Such 

 energy as yours is almost sure to command victory. 

 The world will be much more influenced by experi- 

 ments on animals than on plants. But in any case 

 I think a large number of successful results will be 

 necessary to convince physiologists. It is rash to 

 be sanguine, but it will be splendid if you succeed. 

 My object in writing has been to say that it has 

 only just occurred to me that I have not sent you a 

 copy of my ' Insectivorous Plants ; ' if you would 

 care to have a copy, and do not possess one, send 

 me a postcard, and one shall be sent. If I do not 

 hear, I shall understand. 



Yours very sincerely, 



Ch. Dahwin. 



