Document 0mGNoDMvZwpVLKOKpo48yY1n
510:tu s o f Susan Ikied Inhalation ikspsrijsont a of February 1 9 %
lusbjecb i
who spent two yoav* (7 houra/day)
In the chamber xpoaed to 075 mg/^-f"5 land seaquioxi&o* *05
niono nedien dinastas?* has now boon, out of the chesabsr a
littl over X year* during which tin h lias continued
imdos? observo tion# except for a short raes tion^-psssIHfc# It
appears that ho h m excreted the load which Imd boon
aocAsnilatod during hie exposure, hut its. Is s&ooasary to
follow hie Intel? of- load In- food and beverages on M s
output in the foeea and urina for tono additions! nonths
bofor this can bo established u&culvoa&iXy
-'.subject XI
is still In the cbimbor end so
far has boon exposed C? Iieura/day) for l|r years to 15 ag/.'
lead scsiyaloxld ,05 rilcron median dlamtop* It Is
appn rant that ho has sinosb, but porhspa not -.-.uita, notched
an stquilibrlm with respect to his intake and output of
load, nt a point when th total quaiitity of load rotainod
In his body during tho expcrliant is Just about twice fchet
retained by Subject X during tho sass a7..pr<wsiaafc period
of tin* i
3on months of additional tira in the chambos* will to
necoeottry to establish tits facts with respect to this
o'-ullibriias
,' >
^ Fi-rbhor ;:xperlnont8 Plans ar being mode* quipBKmt Is being casogahlod
end preliminary test ore in progress to proride & controllable conoontrntlott of le&d Its of larger rjodian size ttwn Ites heretofore h m n sod in oia? experiment* It is possible that this experiment can be carried out under condttxon# which simulate more nearly the physical (and ohoaicol) state of the lead in the exhaust o t the automobile# nut that remain to
bo saon* A farther experiment will call for a suitable
experimental subject* it has been believed until very recently that Subject X could be need t^ain in this experiment* It- la possible that this nay bo found to bo imdoslrabl* If this is no decided# a now subjectwill bo found and used In preliminary observations in preparation for this exparim&nfe* The preliminary obsor rations will not need to bo emit so extensive* and pro longed as those carried out In the firstftwo expoeriment In any cap# no prolonged delay will l involvod* cine the observations on both Subject X tim Object II Tw7^S4*s4* bo ccntirmod for some months longer*