£T. 69.] TO A. DE CANDOLLE. 699 
I think I must work at Aster, ete., at Kew fora 
few weeks ; and I have a fancy for a run through the 
west and south of France and, perhaps, Spain! 
You will be returning from some summer trip 
about the time we reach England. Cannot you and 
Mrs. Church get away from a dark and dull London 
November, and go with us to a summer region! 
I sent you my Yale Lectures, which had to treat 
difficult and delicate matters. I find they have been 
useful to some on either side. 
TO A. DE CANDOLLE. 
CAMBRIDGE, June 8, 1880. 
I have left your kind letter of March 11 too long 
unacknowledged. Now I have to thank you fora 
copy of the “ Phytographie,” which interests me ex- 
ceedingly. I have also to say that my plans for the 
year are so far settled that I have engaged passage 
for Mrs. Gray and myself in a Cunard steamer from 
Boston for Liverpool on the 4th of September, the 
earliest date on which we could leave home. 
But, greatly as you tempt me, and much as I 
should like to see you early, we cannot reach Switzer- 
land this autumn... . 
I should hope we might see you in early summer. 
So, pray, keep yourself well and strong till then. 
About the “ Phytographie:” I shall have much to 
write, when I read the book, which as yet I have only 
glanced at. About dextrorsum and sinistrorsum: I 
think it is not quite true that the innovators have not 
given any account of the grounds on which they rest. 
Mine are expressed, I believe, in two or three notes 
in “ American Journal of Science,’ and are summed 
up in my “ Botanical Text-Book,” last edition, p. 516, 
