JANUARY.] GREEN-HOUSE- WATERING. 21 



let the front sashes be opened about one inch or more. 

 An assiduous, experienced hand will never omit an op- 

 portunity. 



With regard to fire heat, the temperature must be 

 regulated to suit the nature of the plants in a general 

 sense; so let the mercury, or spirits of wine, of Fahren- 

 heit's thermometer, be from 34 to 43 ; if it begins to 

 fall, give a little fire heat. No doubt we'have seen the 

 thermometer much lower in the Green-house, than the 

 above, even as low as 24, without any immediate in- 

 jury ; but it was in an extensive collection, where the 

 most hardy of the plants were selected into one house. 

 Many boast how little fire they give their Green- 

 house, and how cold it is kept, not observing the mise- 

 rable state of their plants, inexperience causing them 

 to think, that the least fire heat will make them grow, 

 and would rather look on naked stems than healthy 

 plants. The above temperature will not, in exotics, 

 cause premature vegetation, but will cause the plants 

 to retain the foliage requisite to vegetative nature. A 

 high temperature is not necessary for the generality of 

 Green-house plants ; on the contrary, it might very 

 much injure them. 



OF WATERING. 



In this month very little is requisite, and must be 

 given with great caution. Few plants will require much, 

 and some hardly any ; but all must be attended to, and 

 have their wants supplied. Some will need it twice, 

 some once a week, and some in two weeks, according 



