ANTS AND PLANT-STRUCTURE 387 



among his papers till now. Spruce was very sensi- 

 tive to criticisms of his writings by persons who 

 had not the same knowledge that he possessed ; 

 but in this case I think it probable that he himself, 

 later on, recognised the incompleteness of the evi- 

 dence. A year and a half later he corresponded 

 with Mr. Hanbury on the subject, and he was 

 evidently seeking for more information. I there- 

 fore now print his paper in full, with a few omissions 

 of unimportant details or digressions, giving the 

 passages objected to within square brackets. It 

 will be seen that they involve very slight alterations, 

 in no way affecting the facts or observations of the 

 paper itself. That he intended to modify and en- 

 large the paper may perhaps be concluded from the 

 fact that the paper cover in which the MSS. was 

 kept contains in pencil two alternative titles, both 

 less dogmatic than that on the paper itself. They 

 are as follows : 



(:) "On Changes in the Structure of Plants 

 produced by the Agency of Ants." 



(2) "On Structures formed in Living Plants by 

 Ants, which apparently become permanent 

 in the Species." 



The paper here follows, and I shall at the end 

 adduce a tew additional facts which will serve as a 

 partial reply to the questions put by Darwin.] 



