329 



additional rules with regard to the admission of visitors to 

 the Society's buildings, reported the following regulations : 



The rooms will be open to visitors every Wednesday, from 

 10 A. M. to 2 P. M., and from 3 P. M. to 6 P. M., in summer ; 

 and 5 P. M., in winter. 



The rooms will not, on other days, be open to visitors, unless 

 introduced by a present or past officer of the Society. 



Children, under twelve years of age, will not be admitted 

 without a guardian, who will be held responsible for any injury 

 done to specimens, or property. 



Visitors will not be allowed to handle specimens, unless by 

 express permission of Curators. 



The library will not be open to visitors, except in company 

 with a member of the Society. 



The report was accepted, and the regulations unani- 

 mously adopted. 



Two hippocampi, from Naples, were presented, in the 

 name of Haliburton Fales, Esq. 



Peter Wainwright, Esq., was elected a resident member 



April 20, 1853. 



The President in the Chair. 



Mr. C. J. Sprague read a list of plants, which have 

 been introduced into this country from Europe, and have 

 become naturalized here ; concluding with the following 

 remarks : 



I have given the names of the more common plants natural- 

 ized among us. It will be seen that many of them are common, 

 worthless weeds, which are pests wherever they intrude ; about 

 sixty or seventy of them. So very common are these, that the 

 young botanist who shall begin to collect materials for an herba- 

 rium, will probably secure fifty specimens in a single season, not 



