we 
/ 
mr. 34.) TO JOHN TORREY. 381 
and strong. We think of sending a critical analysis 
of the first part of Mulder, as our joint work (if he 
finds time to put in form the physiological deductions 
I give him), to the meeting of geologists and natural- 
ists at New Haven next month. 
Mulder is very ingenious ; but we can blow up the 
whole line of his arguments, and show that it all 
amounts to nothing; that he has not in this advanced 
our knowledge a particle; and that his generalizations 
are unsound. Why did you not have a part of my 
article reprinted in New York? That would be the 
best reply to all his stuff. 
The printing of my book will be through next week. 
March 530. 
T am now half through, and have got almost done 
with Fungi. The audience take so much to the 
“Cryptogamic matters,” especially the afternoon audi- 
ence, which is as a whole the most intelligent and re- 
fined, that I let them run on, and they will oceupy the 
whole course, except three lectures. I gave one lec- 
ture, generally thought nearly the best, on the large 
ungi, mushrooms, "teufiles, morels, puff-balls, with 
some good general matters. To-day I have taken the 
small ones, moulds, mildews, rust, and smut in wheat, 
with superb illustrations. Ergot is still left over, 
along with the diseases in potatoes, the plant of 
fermentation, the Botrytis that kills silk-worms, with 
some recapitulatory matters on spontaneous generation, 
which must be cooked up for Friday. Then comes 
Allez; the large proper ones (Lecture 8), of which a 
fine series of illustrations is now nearly done. 
Lecture 9. Then the low, minute forms and Con- 
fervee come, and gory dew, red snow, superbly illus- 
