l^i. Arnofi on Warming afid Ve?itilaiing. 



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 impressed 

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

 necessity of fermenting it, *wliere it is to he 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 Qiiarterli/ Journal of 

 Agriculture (vol. vii. p. 44'5. to ^12.), 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-regulating 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, us 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 



