Dear Sir: Washington, April 4th. 1863.
You will please detail Dr. C. M. Wetherill Chief Chemist and F. G. Murray, Esq both of your Department for special service, to report to Capn. I. R. Diller at Philadelphia Pa for one month from date, also giving Dr. Wetherill permission to close his laboratory in the Agricultural Department during that period, and to take its key with him for the security of its contents during his absence. Yours Truly ABRAHAM LINCOLN
The Commissioner of Agriculture