642 TRAVEL IN EUROPE AND AMERICA. [1873, 



hood of Sarracenia flava, which answers to what my 

 Southern correspondent pointed out ; but is not very 

 inarkedo . . . 



CAMBRIDGE, July 7. 



... I have also seen here that water is secreted in 

 the pitcher of Sarr. flava before the lid is open. 



But I have also seen some time ago, when the 

 weather got rather warm, very minute globules like 

 finest dew on the erect part of the lid, near base, in- 

 side. And, lately, during the very warm days, I found 

 in some this increased, and the droplets running to- 

 gether into a clammy exudation. But I want to see 

 more of it. I shall watch, as I get a chance, and the 

 weather gets hot. Look at yours. See if there is 

 anything of the sort in S. purpurea ; I think not. 



I have not the book yet. But I somehow under- 

 stand that this exudation on the lid is mentioned in 

 the English translation of Le Maout and Decaisne's 

 " General Treatise of Botany ! " The French has it 

 not. Very likely it has been found out by Darwin, 

 who finds out everything ! 



. . . Conundrum? Why does the Dionsea trap 

 close only part way, so as to cross the bristles of edge 

 only, at first, and afterwards close fully ? 



Darwin has hit it. I wonder you or I never thought 

 of it. A. G. 



TO A. DE CANDOLLE. 



CAMBRIDGE, October 27, 1873. 



MY DEAR DE CANDOLLE, If I were a better 

 correspondent, I should have long ago thanked you 

 for your interesting and welcome letter of August 11, 

 from Samaden. I was in the Engadine when last in 

 Switzerland, and got near the top of Piz Langarde> 

 when a storm drove me back. 



