252 Catalogue of Works on Gardenings Agriculture^ ^c. 



and, by doing it three or four times, it checked the growth of 

 the plants." 



6. Remarhs 07i the above Paper. By Counsellor Ludolf. 



Saline mixtures of various kinds have been applied to 

 plants with various results. The effect of common culinary 

 salt has been injurious whenever the weight of the salt equalled 

 one third of the weight of the water in which it was dissolved. 

 ]f the quantity of salt equalled the 300th part of the solution, 

 the effects were various. On plants watered with solutions of 

 sulphuric acid, no difference was observed between its effects 

 and those of rain water. Plants which received a solution of 

 saltpetre and sal ammoniac grew better ; but those which were 

 treated with a solution of carbonic acid and ammoniac grew 

 most luxuriantly. 



These facts lead us to suppose that the quantity of saltpetre 

 added by M. Kleemann to his liquid manure, is appropriate 

 to the nature and growth of orange trees. Oily and extractive 

 liquids containing lime and "sugar, and solutions of carbonic 

 acids in water, contain almost all the necessary ingredients for 

 the growth of plants ; and, on this principle, there can be no 

 doubt that the decoction of rye used by M. Kleemann must 

 produce considerable effect. Moreover, the failure of this 

 mixture with pine-apples, experienced by M. Kleemann, may 

 serve as an additional proof that all plants do not bear a 

 manure of salt, or, at least, do not bear salt in equal pro- 

 portions. 



(To be continued.) 



Art. IV. Catalogue of Works on Gardening, Agticulture, Botani/, 

 Rural Architeeticre, S^c., published since June last, "with some 

 Account of those considered the most interesting. 



Britain. 



Curtis's Botanical Magazine, or Flower-Garden displayed; New Series. 

 Edited by Dr, Hooker. In 8vo Numbers, monthly, os. 6d. col. ; 5s. plain. 



No. XVII J. for June, contains 



2826 to 2832. — Cycas (Greek name of a palm) circinalis {circus, a 

 circle; stem formed of protuberant rings); Dioe'cia Polyandria, and Cycadeae. 

 A palm, growing to the height of from 1 5 to 20 feet, and the male and 

 female on diiFerent plants. It was introduced in 1 700, and " is assuredly 

 one of the most ornamental of all plants, but requiring a great deal of space 

 for the display of its leaves." This genus of palms seems to form the link 

 which connects the Monocotyledones with the Dicotyledones, Several 

 botanists have questioned not only the natural family to whicli it belongs, 

 but even the three great classes of the vegetable kingdom to which it ought. 



