February 11, 1952
Dear Captain Shilling,
I was able to take the 500 grams of lyophilized human gamma globulin safely to India.  It went into solution beautifully, and two 5 gram portions were duly injected into two elephants.
Unfortunately, I was not able to stay long enough for the initial immune bleedings, but left precise directions as to how the tests for precipitin should be made, and I hope the elephants do their duty!
These tests, and several other lines of work which I started on elephants aroused a great deal of interest and I think the use of the elephant in immunological studies is assured.
Thanking you again for your generous cooperation, and with kindest regards,
Sincerely yours,
Michael Heidelberger