I had not taken into account the size of the samples actually employed for the analyses, and the amounts of lead found and then multiplied to bring them up to the level of a kilogram.

t 4. art 5art 6. art 7. art 8. art 9. art 10. art 11.

Threshold Limit Values of Air-borne Contaminents For 1968 RECOMMENDED AND INTENDED VALUES Adopted at the 30th Annual Meeting of the American Conference of Governmental Industrial Hygienists, St.

Threshold Limit Values For 1967 RECOMMENDED AND INTENDED VALUES Adopted at the 29th Annual Meeting of the American Conference of Governmental Industrial Hygienists, Chicago, Illinois, May 1-2, 1967.

3 threshold Limit Values For 1966 r t recommended and tentative limits Adopted at the 28th Annual Meeting of the American C nference of Governmental industrial Hygienists, 'Pittsburgh, Pennsylvania, May 16- 17, 1966.

1 Francis J.

._..

Threshold Limit Values For 1967 RECOMMENDED AND INTENDED VALUES Adopted at the 29th Annual Meeting of the American Conference of Governmental Industrial Hygienists, Chicago, Illinois, May 1-2,1967.

Y-4000 Code Liquid Red Lead (modified) ....

T h in secnns of approxim ately 60 m^ were stainod with u ra n y l a ce ta te 1- ami lead n itra te or M illo n ig s lead*J alone.

This loss is particularly heavy amongst the larger size particles, and hence leads to a considerable reduction in the sur face area of the rock particles contained in a sample.

Y-4000 Code Liquid Red Lead (modified) ....

No. 17 MR EFFECTIVE APtll IS, 1963 SUBJECT TO CHANCE WITHOUT NOTICE MAINTENANCE FINISHES PRICE LIST THE GLIDDEN COMPANY NATIONAL HEADQUARTERS, CLEVELAND 14, OHIO Factories from Coast to Coast Branches in Principal Cities GLD026901 MAINTENANCE FINISHES PRICE LIST No. 17 MR - Coda Cals.

It is some times contended that dust accumulation, with its associated fibrosis, in the hilar glands causes lymph stasis and thus leads to retrograde parenchymal accumulation of dust, but the evidence from both man (Simson, Strachan and Irvine, 1931) and animals (Heppleston, 1954b, 1958) contradicts this view.

Liqiid Red Lead (modified) ................