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PROTHONOTARV^s OFFICE, PhlladclpUa county. 



IBO certify that on thh %<)th day of April, I789, a Bool entithd " Tranfaaions of the Amcncaw 



Philofophicai Society, held at Philadelphia, for promoting ufcful Knowledge," nwl. i. the fe- 



cend edition corredhd, printed at Philadelphia, by K. Aitkcn & Son, at Pope s Head, in Market- 



htred^ 'was cfda^d i/i my office y ^^ Robert AitkciK 



JAMES BIDDJ.E, Tkot, 



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