154 Arnott on Warming and Ventilating, ^ 



Art. III. On Liquid Manures. By Cuthbert W. Johnson, Esq., 

 Barrister at Law, Corresponding Member of the Maryland Hor- 

 ticultural Society. Pamph. 8vo, 39 pages. 



What the English cultivator requires chiefly to have inripressed 

 on his mind, with reference to liquid manure, is, the absolute 

 necessity of fermenting it, laJiere it is to be made the most of. This 

 Mr. Johnson has stated in a quotation, in his fourth, fifth, and 

 sixth pages ; and ^we wish he had stopped there, and endeavoured 

 to impress on the mind of the reader the necessity and advan- 

 tages of fermentation. This he had an admirable opportunity 

 of doing, from an article published in the Qiiarterly Journal of 

 Agriculture (vol. vii. p. 445. to 472.), about nine months before 

 the date of his pamphlet. 



Art. IV. On Warming and Ventilating ; 'with Directions for mak- 

 ing and using the Thermometer Stove, or self-regidating Fire, and 

 other Apparatus. By Neil Arnott, M.D., F.R.S., &c., Physician 

 Extraordinary to the Queen, Author of the "Elements of Physics," 

 &c. 8vo, pp. 138. 



We have more than once in preceding volumes, strongly recom- 

 mended Dr. Arnott's Elements of Physics to the young gardener; 

 and, though the work now before us belongs rather to domestic 

 economy and architecture, than to horticulture, yet it is a work 

 that every man who lives in apartments warmed artificially may 

 benefit by perusing. We are much mistaken if the stove in- 

 vented by Dr. Arnott does not prove one of the greatest bless- 

 ings to society, in the way of heating, that it has ever participated 

 in since the invention of chimneys. In our two preceding Num- 

 bers (p. 57. and 95.), we have spoken highly of Mr. Joyce's stove, 

 mentioning it as one, perhaps, of the most extraordinary disco- 

 veries which had been made since the invention of gunpowder; 

 viz., the combustion of fuel without the production of deleterious 

 gases. There is nothing inconsistent, as might at first sight be 

 supposed, in our equal admiration of the two inventions ; for the 

 two together may, perhaps, be considered as supplying every de- 

 sideratum that can be required in a dwelling- house in the way 

 of warming. For heating rooms and closets that have no chim- 

 neys, for heating particular parts of rooms, or, in short, for carry- 

 ing about a supply of heat to be immediately made use of in any 

 part of the house, as one carries about a supply of light by means 

 of a lamp or a candle, recourse will be had to Joyce; but for keep- 

 ing at a steady temperature rooms that have chimneys, at little 

 expense, Arnott's stove is decidedly the one that claims the pre- 

 ference. Mr. Joyce, when we had last the pleasure of seeing him, 

 was of opinion that his stove would be a source of great economy 



