240 Account of Mr. Walker's Hot-house Flues. 



leaving one of the covering flags moveable, to afford access 

 to it. Several parts of the top of Mr. Walker's flue are 

 fixed with screws, so as to admit of its being opened for 

 cleaning ; and should round flues of cast iron be used, which 

 I suppose would be the cheapest, the best arrangement for 

 that purpose would, perhaps, be openings at the corners. 



This short sketch will, I hope, be sufficient to impart a 

 distinct idea of the principles of Mr. Walker's invention : 

 and I deem it superfluous to enter into a detail of the minute 

 particulars of the parts, as every individual will be competent 

 to direct them according to circumstances. T have only to 

 add that Mr. King's green-house was found, on the trial du- 

 ring last winter, which was very severe, to answer to the fullest 

 extent all the expectations that could have been formed of 

 it, having been remarkable .for uniformity of temperature 

 both in the several parts of the house, and at the different 

 times of the night. 



