New Mode of destroying Insects and Vermin. 557 



a horticultural garden and a zoological garden, will soon be 

 liable to the same injury from smoke as the other. We have 

 seen a plan for the new garden, which as it is not understood 

 to be determined upon, we forbear to criticise. 



While writing this article, we have received a letter from 

 Mr. Mowbray, curator of the Manchester garden, stating that 

 we have misrepresented the mode of planting that garden 

 when we affirmed (p. 413.) that " the nurses are composed of 

 one common mixture throughout the garden." Such, as- 

 suredly, was, and still is, our impression. However, we are 

 very likely in part wrong ; which we exceedingly regret, for 

 we have been long proud to call Mr. Mowbray our friend, 

 and there is no man for whose independence of character we 

 have more respect. We insert his letter under the head 

 of Retrospective Criticism, and we invite such as take an 

 interest in the matter to examine the garden, and send us a 

 plan of two or three portions of the plantations referred to in 

 Mr. Mowbray's letter, placing numbers in the plan for the 

 position of each tree, and giving us a list of the names of the 

 trees or shrubs corresponding with the numbers. This will 

 decide the thing at once. 



Of Public Promenade Gardens^ there is only one small one 

 in Liverpool, St. James's Walk. It is in a fine elevated situ- 

 ation; but, as we have before stated (p. 525.), such a town as 

 Liverpool requires something of this kind upon a very differ- 

 ent scale. There are none in the other towns that we passed 

 through. The difference between the Continent and Britain 

 in this respect is most remarkable. The smallest town, both 

 in France and Germany, has its public garden; and all the 

 considerable towns have scientific gardens, combining a bo- 

 tanical arrangement with the plants of horticulture and agri- 

 culture. 



J. C. L. 

 Assembly Sitreet, Dumfries, Aug. 4t. 1831. 



Art. II. On the Application of the A mmoniacal Liquor of Coal 

 Gas to the Destruction of Insects and Vermin. By Robert 

 Mallet, Jun., Esq. 



Sir, 

 I CANNOT delay sending you an account of a discovery 

 which, I believe, I am the first to make, and which, however 

 simple and unimposing, will, I think, be of considerable value. 

 It is no more than the application of the ammoniacal liquor 

 of the coal gas works to the purpose of destroying insects 



