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B. L. ROBINSON, Curator, 
Asa Gray Prof. Syst. Bot. 
M. L. FERNALD, 
Fisher Prof. Nat. Hist. (Bot.) 
J. F. MAC BRIDE, Assistant 
H. ST. JOHN, Assistant 
MARY A. DAY, Librarian 
CAMBRIDGE, MASSACHUSETTS, U. S. A. 
Feb. 5, 1919. 
Prof. J. Collins, 
468 Hope St. , 
Providence, R.I. 
Dear Collins: 
I am glad that you are coming up Friday and I hope it 
will be possible for you to spend the night. The photographic 
apparatus I wrote about was a somewhat special combination got 
up by Bauseh & Lomb based partly on their no. 33116. Here is 
a rough diagram of it - a bellows on a vertical rod with adjust¬ 
ments to fit over a compound microscope or a simple dissecting 
microscope and a long baseboard with electric illuminating appar¬ 
atus at one end. It will probably be very simple for you, but 
since neither Dr. Robinson or I have ever used such an appara¬ 
tus we didn't wish to make any blunder and injure anything by 
experimenting blindly. 
Hope to see you Friday. 
As ever, sincerely, ^ 
Dictated to HB 
