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NATIONAL GALLERY OF ART 
NATIONAL COLLECTION OF FINE ARTS 
FREER GALLERY OF ART 
INTERNATIONAL EXCHANGES 
DIVISION OF RADIATION AND 
ORGANISMS 
March 28, 1949. 
We have all heaved a sigh of relief after having word from 
you that the Lesson volume was with Deignan. Mrs. Gazin was fearful 
that you might have returned the volume to her and that in some way it 
had become lost between your office and hers. She is writing for an 
extension of time on the volume since Mr, Deignan did not have 
opportunity to do all the work necessary on it. He had to be away from 
the office for a few days last week. 
I am sorry that it is necessary to trouble you with more proof 
reading, but Mr s Oehser asked that the enclosed be forwarded to you. 
I am also enclosing a letter marked “Very Urgent - Please Forward.” 
The following letter from Dr. Dryden is self explanatory. I 
telephoned him and told him that you were in Panama thinking that this 
would settle the matter until your return but he asked that I send the 
letter to you in the next mail. 
“Doctor T. P. Wright and I are proposing Mr. Addison M. Rothrock 
for membership in the Cosmos Club on the Ground of 
meritorious original work in physics. I believe that you are 
familiar with Mr. Rothrock’s contributions to the fundamental 
study of combustion, fuel injection, and knock rating of fuels. 
If so, it will be helpful to the consideration by the Admissions 
Committee of our proposal if you will write a letter to the 
Admissions Committee, stating why you believe his work makes 
him eligible and testify as to his character and personality.” 
Mrs. Helen Younger has written you asking special escort for 
a friend and her two sons who expect to visit the Museum. We told her 
that we would be glad to take care of them in your absence ! She also 
said that Senator Walcott has suffered another stroke and was very feeble. 
You have a notice this morning from the National Advisory Committee 
for Aeronautics that the inspection of the Langley Laboratory is scheduled 
for May 18, 20 and 24. It looks as though you could have a very busy time in 
May! 
No further word from Mr. Leigh. 
UNITED STATES NATIONAL MUSEUM 
BUREAU OF AMERICAN ETHNOLOGY 
ASTROPHYSICAL OBSERVATORY 
NATIONAL ZOOLOGICAL PARK 
ALL CORRESPONDENCE 
SHOULD BE ADDRESSED 
TO THE SECRETARY 
SMITHSONIAN INSTITUTION 
Washington, IZS.A. 
Dear Dr. Wetmore: 
