Document 6wnvnMvbLL73n77z0DG1oeYE

*lUta f. ftsgir Mm Booth Jan* 3t*. January so, 1937 Ur* Barnes, Peatiaghouae Co*, last Pittsburgh, Pa* Dear Ur. Barnes: Tfhan Dr* Haalett suggested that we inoculate another series of anlaals with enamel, Z mentioned to him that I should like to sake up fresh suspensions of the dust* mould you be hind enough to bring or send m* another sample of the material sad would It take too long for you to do size determinations? Ton remember the particles in the first staple ware all smaller than 10 nlorons* here. I'm sorry I missed you when you were Very truly yours.