278 WORK ON 'MAN.' [1868. 



an essay on man, it flashed on me that I could work in some 

 "supplemental remarks on. expression." After the horrid, 

 tedious, dull work of my present huge, and I fear unreadable, 

 book ['The Variation of Animals and Plants'], I thought I 

 would amuse myself with my hobby-horse. The subject is, 

 I think, more curious and more amenable to scientific treat- 

 ment than you seem willing to allow. I want, anyhow, to 

 upset Sir C. Bell's view, given in his most interesting work, 

 'The Anatomy of Expression,' that certain muscles have 

 been given to man solely that he may reveal to other men 

 his feelings. I want to try and show how expressions have 

 arisen. That is a good suggestion about newspapers, but my 

 experience tells me that private applications are generally 

 most fruitful. I will, however, see if I can get the queries 

 inserted in some Indian paper. I do not know the names or 

 addresses of any other papers. 



. . . My two female amanuenses are busy with friends, and 

 I fear this scrawl will give you much trouble to read. With 

 many thanks, 



Yours very sincerely, 



CH. DARWIN. 



[The following letter may be worth giving, as an example 

 of his sources of information, and as showing what were the 

 thoughts at this time occupying him :] 



C. Darwin to F. Miiller. 



Down, February 22 [1867]. 



. . . Many thanks for all the curious facts about the un- 

 equal number of the sexes in Crustacea, but the more I in- 

 vestigate this subject the deeper I sink in doubt and difficulty. 

 Thanks also for the confirmation of the rivalry of Cicadae. I 

 have often reflected with surprise on the diversity of the means 

 for producing music with insects, and still more with birds. 

 We thus get a high idea of the importance of song in the ani- 

 mal kingdom. Please to tell me where I can find any account 

 of the auditory organs in the Orthoptera. Your facts are 



