500 Hayward? s Inquiry into the Causes, fyc. 



REVIEWS. 



Art. I. An Inquiry into the Causes of the Fruitfulness and Barren* 

 ness of Plants and Trees ; tvith Practical Instructions for the 

 Management of Gardens and Farms, and a System of training 

 Fruit Trees, S^c, founded on Scientific Principles. Arranged as a 

 Dialogue. By Joseph Hay ward, Esq., Author of the " Science 

 of Horticulture," &c. 12mo, 292 pages, cuts. London, 1834. 



Mr. Hayward is advantageously known to our readers by 

 his scientific communications in this Magazine, and by his work 

 entitled The Science qf Horticulture. The present little volume, 

 he informs us in his preface, is to " convey, in a compact and 

 simple form, the substance of the more important parts of his 

 former works on horticulture and agriculture, together* with the 

 results of much subsequent observation and experiment." The 

 work is conducted in the form of a dialogue, in which are dis- 

 cussed, in succession, the chemistry of vegetation, and the nature 

 of soils and manures, or, as the author prefers to term them, the 

 food of plants ; the production of varieties ; and vegetable struc- 

 ture, and vegetable diseases. This part of the work, which 

 extends to 169 pages s constitutes the science of cultivation ; and 

 the remaining part is occupied with " A System of Practice 

 founded on the Science." We have our doubts as to some 

 points of the practice, particularly as to the mode of training 

 the peach; and we cannot assent to the assertion (p. 37.) that 

 " worms do not in any manner injure living plants." Every 

 one who has had the care of plants in pots must be of a different 

 opinion. However, with a very few exceptions of this kind, 

 which the practical man can easily guard against, we consider 

 the work a valuable accession to horticultural literature ; and, as 

 it is cheap (25. 6d.), we would very strongly recommend it to 

 every young gardener : for in nothing do we more heartily con- 

 cur with Mr. Hayward than in this, — " that the most valuable 

 part of the knowledge which a thoroughly sound and accom- 

 plished horticulturist or agriculturist should possess, will be 

 found, on enquiry, to be of such a nature that it not only may, 

 but must, be obtained by reading." (p. 4.) 



Art. II. Transactions qf the Horticultural Society of London. 

 Second Series. Vol. I. Part III. 4to. London, 1833. 



(Continued from p. 230.) 



30. Notes on the Solving and Cultivation of the Sheeraz Tobacco. 

 By Dr. Riach, of the Hon. East India Company's Medical Service, 



The plants are grown till they are between two and three feet 

 high, at which time the leaves will be from 8 jn. to 1 5 in. long. At 



