10 Direction of the Branches of Trees _ib._ 11 Effects of Light on Vegetation _ib._ 12 Organization and Reproduction of the Trufle 491 13 Alteration of Corn in a subterraneous Repository 492 14 Quick Method of putting Insects to Death 493 15 Destruction of Snails by common Salt _ib._ 16 Remarkable Hairy Man _ib._ 17 Application of Remedies by Absorption from the Surface _ib._ 18 On the Strix Cunicularia, or Coquimbo Owl 494 19 Naturalization of Fish 496 20 Mode of keeping Apples _ib._ 21 On the Cultivation and Forcing of Sea Kale 497 Meteorological Table 500 TO OUR READERS AND CORRESPONDENTS. The drawings, illustrating the construction of a Blow-pipe, are not sufficiently accurate to enable us to publish them. Our Correspondent will observe that we have noticed another part of his letter. We regret that we are unable to offer our Correspondent, upon the subject of _Gas Works_, any precise information. There can be no doubt that an atmosphere tainted by coal gas is injurious to animal and vegetable life, but much will depend upon the extent of the contamination, and other causes, of which our limits prevent mention. To say nothing of danger from fire and from explosion, it has always been matter of surprise to us that gas-works are tolerated by the government in close and confined situations—that the Thames is suffered still to be polluted with their offal, and that they are sometimes placed close by the road side, (as at Brentford,) to the nuisance of every one who passes. These matters want looking into. Q. will find an answer to his question, in the “Gazette of Health” for last July. F. R. S. must remain unanswered till after St. Andrew’s Day. Dr. Heinecken’s paper is disposed of as he desired. Mr. BRANDE and Mr. FARADAY will commence their Lectures and Demonstrations in Theoretical and Practical Chemistry, in the Laboratory of the Royal Institution, _on Tuesday, the 9th of October_, at Nine in the Morning precisely. Further particulars, and a Prospectus, may be obtained at the Royal Institution, 21, Albemarle-street, or by application to the Lecturers. _In the Press_—A COLLECTION OF CHEMICAL TABLES, for the use of Students, in Illustration of the Theory of Definite Proportionals, in which are shewn the Equivalent Numbers of the Elementary Substances, with the Weights and Volumes in which they combine, together with the Composition of their most important Compounds, and the Authorities for their Analysis. By WILLIAM THOMAS BRANDE. THE QUARTERLY JOURNAL OF SCIENCE, LITERATURE, AND ART. JULY—OCT. 1827. _On the Beauties contained in the Oval, and in the Elliptic Curves, both simple and combined, generated from the same Figure or Disk_. By R. R. Reinagle, Esq., R.A. Being the subject of a Discourse delivered at the Royal Institution of Great Britain.