Document vyQZ5V1bXd46NNxZL4Dy8Ev3w

9 In replying addreee the Surgeon General D. t. Public Bealth Berrios federal securiti agdici V. 8. PUBLIC BIJLTR Btt?ICI Washington U (Bathesda Station) February 2J, 1949 Ir. VUUu Z. Pluck Industrial Byglene Division Wisconsin State Beard of Bcalth State Office Building 1 Vest Vllson Street adlaon 2, Vlieencia Bear Ir. Plucki Throughi Or. Carl B* Beupert State Bealtb Officer The caaple of nettled duct uhleh you cubnltted with yo'ir letter of January It, 1949 haa been aaalyaed oltb the felleving reaultat Lab. Bo. Field Identification Free Silica labtatof 12915 Settled duet fron cutting of I-LO ( 13 % (See note)* There are a number of ehenleally different mlaernln uhleh are included under the general daaaif1 cation of aabeatoa. To enalyxe for each of these would be a coo aideruble task. In- ctetd a erublned nlercacople and chenleal procedure haa been uaed to approximate the aabeatoa content of the sample. There la nore than 5$ and probably leaa than 12$ of aabeatoa in thla ample. Chryaotile la by far the principal nlneral In eoe- nerelal gradea of aabeatoa, but la vaa not nlgnlfleantly preaent la thla aanple. ' ery truly youra. CRBiJim CCt PBS Regal* Of. J* 0. B. Byera, Solentlat laboratory Sectloo Division of Industrial Bygleet *