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F o r m 53. N EW SOUTH W ALES. OFFICE OF THE DIRECTOR GENERAL OF PUBLIC HEALTH. 33455 5.34 93 MACQUARIE STREET, SYDNEY, 2 3 rd No ve m be r, 19 34 * . LJH. D r . K. F a ir le y , Fr a n cis House, 107 Co llin s St r e e t , MELBOURNE. VIC. Dear Dr . F a ir le y , Dr . T a y lo r h a s ju s t com p leted th e le a d in u r in e d e t e r m in a t io n s fo r yo u r t h r e e T e t r a - e t h y l Le a d w o r k e r s , and t h e y do n o t a p p e a r t o h a ve in h a le d o r s w a llo w e d much o f t h e e t h y l. . M o ffa t t an d Pr yk e show .0 2 mgm. p e r l i t r e , and Alle n .0 6 . Bu t com pare Alle n w it h 400 b a s o p h ilic c e lls ; is t h is chance or a ver y d e lic a t e t e s t ? Yo u r s s i n c e r e ly C.o . R. Me d ica l O ffic e r o f In d u s t r ia l Hygie n e . (p \ sl Co . , "w . A