Thank you very much for your letter of Novemebr 25 and the information that you sent along. We shall begin using this method
and will slowly accumulate somekind of data on the problem. Needless to say, I would not undertake for either myself or any
of my students the kind of exhaustive systematic analysis which would put this method on a firm basis. I hope I'm not
bothering you too much, but you mentioned that the vials you employed possess the catalog number 111, but you didn't mention
what catalog this referred to. This is something I would like to know. To make things a bit easier I am enclosing a self-addressed
penny post card on which you can jot down that bit of information. Finally I must confess to ignorance of one of your terms
spelled "bels." What in the name of heaven is that?