Letters Sent to Dr. Frederick B. Flinn, September 10, 1928

September 10, 1928 Dr. Frederick B. Flimn College of the Physicians and Surgeons Columbia University 168th Street New York City Dear Dr. Flimn: I spent a very restful week in Northern Michigan and have just returned to my office ready for a semestor of energetic worke I did not feol in the mood while in the woods to transcribe the laboratory notes which I took with me but I shall attend to this natter vary shortly. I have written to Barker suggesting that he become one of our subjects for the proposed experiment on the radium determina- t ions in excrets. The experimental deta which you gave me just before we parted seems to me ai are only qualitative in nature. In order to make experiments of this kind quantitative, wa must have the radium content and total weight of ashed residues. Now I recall that you showed me the residues upon which you made alpha ray measurements by film method, and I believe that Barker made one or two radium determinations. I hope that the residues you had represent the totals and that by weighing these up we could calculate the total radion content. I may say that if the analytical determinations of the radium contont of any of these semples representing excreta from Mrs. Dumschott should be made, I shall ba glad to do this. 1 have also proposed to Mr. Barker that I bhall be glad to make the radium determinations on the residues representing his excrets. Shall wa procesd with experiments of this kind? Perhaps you will find another subject or two when you make the tests for radioactivity on the girls next week at Waterbury. Hoping that you feel rested and roady for a year of activa work, A remain Sincerely yours, HS e b