Carbon copy of a typescript letter. Charles Riches, the patent lawyer retained by the Insulin Committee, writes to Dr. Murlin regarding Dr. Murlin's letter to Prof. Macleod on September 25, 1922. Mr. Riches requests that Dr. Murlin send him information regarding the patent Dr. Murlin proposes to file for his own anti-diabetic agent. Dr. Murlin responded to Mr. Riches request on October 7, 1922.