THE ROCKEFELLER INSTITUTE
  FOR MEDICAL RESEARCH

66TH STREET AND AVENUE A
      NEW YORK

June 23, 1924.

Dear Heidelberger:

Your letter written from London about the

middle of May deserved a more prompt reply.
pleased to hear from you, and to learn that you were enjoying
London and that your wife and baby were well,

I was very much

You seem to have been very industriously oc-

cupied in visiting- galleries and laboratories, and all you tell
me of the latter interests me very much.  I am particularly in-
terested in what you say of the possibility of baving x-ray
cryatallogame made of your oxyhamoglobin crystals.

Wright at St. Mary's stands a good deal alone,

I fear - he ad his little group of disciples.
ordinary man, brilliant;  but it is I suypose questionable whether
the methods he personally employs so well are sufficiently quanti-
tative to be generally apylied,
in some modified form they will come into use in time.

He is an extra-

It may indeed very well be that

           In the meantime, the base of immunology is chanp
ing somewhat.
and physical - as you well know, and new phenomena,  such as bacteri-
ophage, etc. bring about new points of view and directions of work.
It is perhaps as well that we are diverse in our interests, for in
this way different things and methods come to be tested and progress
is accelerated,

It is drawing more heavibly on chemistry - organic

By this time you have moved further on, to the

continent probably.
wife, and sister-in-law find all your experiences.
remin well.

I can iiragine how full of interest you, your

I hope you all

My wife and I send you all very lpasm regards.

Yours sincerely,

Dr o Michael Heidelberger , L-3-
c/o American Express Go. ,
11 rue Scribe,
Paris, France.