§ 
fiov. 22./21. 
13 
details I will think up some more. The influence of mycorrhiza 
on the distribution of orchids is an untouched field. I believe 
my Goodyera paper is the first suggestion based on actual ob¬ 
servations in the field. 
A herbarium is an absolute necessity. The man who studies 
the proper methods to make good specimens c nfers a great 
benefit on the herbarium botanist. C. G. Pringle made wonder¬ 
fully good specimens of Mexican orchids. Harry Johnson who 
recently returned from Guatemala brought me a perfectly pre¬ 
pared set that he made at Coban in Depert, Altaverapaz. It is 
a great pleasure to work through the specimens. Just as soon 
as you feel sure of your comparisons you ought to get together 
sets and distribute them as your contribution to orchidologyw 
A man who studies the preparation of his dried material goes 
down in Botanical History. 
There is one way in which you can help me if you wish to 
take the trouble. Put some flowers in formaline solution of 
the more common species so that I can have them drawn for Hr. 
Standley's flora. 
I have marked your list almost in toto because I want to 
have the species represented in my herbarium from Panama and 
I want them to authenticate my geographical records for the 
flora. Whenever your specimens are cited you will be given 
credit in the usual way. 
I enclose Stspf r s letter that you wished returned to you. 
With the best of good wishes, and at your service. 
