x ii LAWS AND REGULATIONS OP THE SOCIETY. 



Art. XVIII. The Curators shall have the care of the library, speci- 

 mens of natural history, models of instruments and machines, and of such 

 other matters belonging to the Society as may be committed to them. 



Art. XIX. The Treasurer shall discharge the duties incident to 

 such office in similar cases. 



Art. XX. The duties of the officers shall be more particularly de- 

 fined in the by-laws. 



