566 Snmmarij Vieto of the Progress of Gardening, 



published in 1831 ; and unless we refer toa short article in our 



Encyclopccdia of Garde?n7ig, second edition, published in ISS^, 

 entitled, " Origin of Culture, as derived from the Study of Vege- 

 tables," we scarcely know of any other author who has made 

 any attempt of the kind. 



In the Penny Cyclopcedia, the gardening articles, as well as the 

 botanical ones, are understood to be written by Dr. Lindley, and 

 they are all tre^-.ted scientifically. These articles alone, in our 

 opinion, give this Cijdopcedia a decided claim to the preference 

 of the gardener, independently altogether of its extraordinary 

 excellence in other respects, and its low price. 



Mr. Westwood's valuable papers on insects injurious to gar- 

 dens are continued through the present volume ; and, under our 

 articles headed General Notices, will be found many interesting 

 paragraphs on the subject of vegetable physiology, and on other 

 topics which belong to the science of gardening, for the details 

 of which we can only refer to the table of contents. 



AVcO Agents of Cidture. — A simple and economical trap for 

 catching birds is described in p. SOI. ; a mode of protecting 

 grapes from sparrows by means of black thread is noticed in 

 p. 529. ; and a new turf-racer and verge-cutter in p. 176. A 

 flower-pot, with exterior ribs, or bands, pierced with holes for the 

 insertion of wires, so as to form a circular trellis or cage for 

 training climbers, has been invented by Mr. Halliday, and will 

 be figured and described in our next volume, as will a new ven- 

 tilator for hot-houses, by Messrs. Daft, hot-house builders. 



Joyce's mode of heating by steam, described in p. 370,, and 

 Corbett's mode of heating by circulating hot-water in open gutters, 

 described in p. 147., may be referred to, though in our opinion 

 they are neither of them likely to prove of any value. Gas tar 

 has been proved not to be injurious to trees of the commoner 

 kind, (see p. 5 12.) ; and may, therefore, sometimes be employed 

 to deter animals from barking them, or rubbing against them. 

 At best, however, it is but a palliative for an evil, which can only 

 be effectually prevented by proper tree guards, such as that in- 

 vented by Chas. Lawrence, Esq., and described in our preceding 

 volume. Jauffret's new manure (p. 184-. and 299.) may be re- 

 ferred to, not as deserving to be manufactured in this country, 

 where manure is comparatively abundant, but as affording some 

 useful hints for the management of putrescent manures gene- 

 rall}'. At p. 341. something further will be found on dry-rot, 

 and on the Kyanising process ; though the latter promises to 

 be superseded by the use of the sulphate of copper (see Archi- 

 tectural Magazi)ie, vol. v. p. 284.), which does not cost above 

 a tenth part of the expense of the corrosive sublimate. A bi- 

 tuminous mastic or cement, under the name of asphalte, has 

 lately been introduced from France ; and, among numerous other 



