.bs. 



oz. 



2 



10 



2 



2 



1 



8 



1 





1 



5 



1 



14 



193 



In the cabinet of Mr. Joseph Clark, of Cincinnati, I found the fol- 

 lowing species of enormous weights. They were found by him in 

 that vicinity, where mine were also procured. 



Unio crassus, 

 Unio crassidens, 

 Unio tuberculatus, 

 Unio securis, 

 Unio rectus, 

 Margaritana complanta, 



Pfeiffer's heaviest weight given, of the European species, is 8 oz. 

 apothecaries' weight, in the " Unio sinuata''' (margaritifera), which is 

 equal to 6 oz. avoirdupois, the weight used above. 



The Society then proceeded to consider the proposed altera- 

 tion of the Laws, when, on motion, Chapter VIII. Sect. 7th, 

 of the Laws of the Society, was amended so as to read as fol- 

 lows: — 



" He shall receive an annual salary of six hundred dollars, from 

 the treasury of the Society." 



Pending nominations, from Nos. 242 to 255, were read. 



On motion, permission was granted to the Historical Society 

 of Pennsylvania, to have a copy of the portrait of Mr. Hecke- 

 welder in the possession of this Society, painted under the su- 

 perintendence of the Librarian. 



Stated Meeting, April 18. 



Present, thirty-one members. 



Dr. Patterson, President, in the Chair. 



Dr. C, M. Wetherill, recently elected a member of this So- 

 ciety, was presented and took his seat. 



Letters were read: — 



From Joseph W. Farnum, dated London, March 21, 1851, 

 acknowledging the receipt of notice of his election as a member 

 of this Society: — and 



