Leonard.] ^9o [Xov. 20, 



fifth, millenuium, was next treated. A number of the ex- 

 tremely rare Kappadohian tablets, of which, more than sixty 

 have been obtained for the University of Pennsylvania through. 

 Dr. Hilprecht's efforts during the last four years, a historical 

 document of the time of King Nabonidus and a marble vase 

 of King Artaxerxes witli four inscriptions in Persian, Median, 

 Babylonian and Egyptian languages were likewise exhibited 

 and partly interpreted. 



Dr. Charles L. Leonard then read a paper on a " Xew 

 Physical Property of the X-Ray." 



Dr. Frazer reported that the preparation of the plates for 

 the reproduction of the signature book would require an addi- 

 tional appropriation of $80, 



On motion of Mr. McKean, the appropriation was made. 



Mr. Goodwin then moved that the Secretaries be instructed 

 to prepare from the plates now made 250 copies, to be sold 

 only to members at cost, not more than one copy to be pur- 

 chased b}^ any one member until further orders from the 

 Society. Carried. 



Dr. Morris moved that the Society present to the "Wistar 

 Institute a bust of Franklin and one of Dr. Wistar, these 

 being in duplicate. Carried. 



The rough minutes were then read, and the Society 

 adjourned. 



New Physical Pheno^nena of the X-Ray. 



By Charles Lester Leonard, A.M., M.D. 



{Bead before the American Philosophical Society, November 20, 1S96.) 



The. pli^ysical plienomena connected with the x-ray arc at present 

 limited to those announced by their discoverer, Prof. "\Tilhelm Konrad 

 Rontgen. They are their power to penetrate substances formerly con- 

 sidered opaque, their chemical action exhibited upon the photographic 

 film and fluorescent screen, and their power of discharging electrified 

 bodies whether positively or negativelj^ charged. 



The simple experiments which I conducted at the Pepper Laboratory 



