498 THE GREEN-HOUSE; [SEPT: 



" Naturalists, (says Pliny) admit of distinction of sex not only in 

 trees, but in herbs, and all plants ; yet this is no where more ob- 

 servable than in Palms, the femals of which never propagate but 

 when they are fecundated by the dust of the male." 



te. Those who wish to become scientifically acquainted with 

 the Unnffan, or sexual system of plants, will be greatly edified by- 

 consulting that very valuable work, the " ELEMENTS OF BOTAKY", 

 published in 1303 by BENJAMIN SMITH BARTON, M. D. Professor 

 of Materia Aledica, Natural History, and Botany, in the University 

 of Pennsylvania. 



DOCTOR BARTON has for several years been preparing mate- 

 rials for a FLORA PENSYLVANICA, or a scientific desciiption of 

 the indigenous plants of Pennsylvania, which it is to be hoped he 

 will shortly publish ; as by it the public will become acquainted 

 with many rare and valuable plants, not hitherto described ; and 

 also, with several others, delineated so imperfectly by European 

 writers, perhaps from dried specimens, as not to be known by their 

 descriptions. 



THE GREEN-HOUSE. 



IN the eastern states, between the fifteenth and latter end of this 

 month, according to local situations, the nights will be getting 

 cold, and consequently, the more tender kinds of Green-house plants 

 must be taken in, before they change their colour by too much 

 cold, leaving the hardy sorts out as long as there is no danger of 

 their being attacked by frost. 



Some people are desirous to keep out their plants as long as 

 possible, this is very right, but it ought not to be extended to too 

 hazardous a period, for one night's frost would cause the leaves to 

 lose their fine green colour, which perhaps might not be restored 

 during the whole winter, and if any way severe, serious injury 

 might be sustained. 



If the windows and doors are kept open, day and night, as long as 

 there is safety in so doing, the plants will be nearly as well off as if 

 in the open air, and no danger is encountered : the mere differ- 

 ence of five or six days in the taking in of the plants \vill insure 

 safety ; but on the other hand, it is not right to be too precipitate in 

 housing them, before the common appearance of the weather 

 indicates the necessity. 



For further particulars respecting the housing of the plants, see 

 next month, which is the period for doing that business in the mid- 

 dle states. 



