A chemist cannot do one or two lead determinations a year and depend upon his accuracy.

The amount of lead over 3 c.c. for the month of June- shows a slight decrease now averaging 3.12.

This man has probably had significant lead exposure, the lead concentration being veil above the level associated vith safe occupational exposure to lead compounds.

on this date also showed presence of lead line.

MKMQlUillXJW TOl ATTjOITIOMI copy ioi Lead Industries Association Mr.'

) '7e have been able to work out very accurate lead intake and lead' output over periods of from 1 to 6 weeks, and to contrast these results with calcium intake and output.

. --..... 2.5 Lead; lead carbonate; lead chloride; lead nitrate; lead - 0.15c ' " oxides; lead"sulfate^ ------ -- ~ ------ Manganese, and compounds.............................................. ........-- 6.0C ; Mercury, and compounds. ......... ............ ----.------------ - 0.1 rentachloronaphthalene____________ __________ -----______-- ...

BOSTON AND PITTSBURGH TO CHANGE CORPORATE NAMES Steps have been taken to change the name of Nationul-Boston Lead Co. to National Lead Company of Massachusetts and National Lead & Oil Co. of Pennu. to National Lead Company of Pennsylvania.

Lead; lead carbonate; lead chloride; lead nitrate; lead oxides; lead sulfate.

Both had relatively high lead concentrations in the urine, however, and it was-obviously inadvisable to return them to work involving any lead exposure until they had reached the level which we have established as compatible with safety in that regard.

Cards similar to those shown in Figures 4 and 5 can be set up for the blood-lead samples.

This man has probably had significant lead exposure, the lead concentration being veil above the level associated vith safe occupational exposure to lead compounds.

Both had relatively high lead concentrations in the urine, however, and it was-obviously inadvisable to return them to work involving any lead exposure . unti|.X they had reached the level which we have established as compatible with safety in that regard.

I do not believe that age perse, is a dis advantage in relation to lead exposure.

Your problems would be much more like that seen in the plants in which tetraethyl lead is manufactured.