TABLE OF CONTENTS 



TO THIS SIXTEENTH VOLUME. 



JANUARY, 1807. 



Engravings of the following Objects : 1. A Diagram, by John Gough, Esq. to 

 illustrate the Doctrine of Mixed Gases ; 2. A very simple Scale for Drawing 

 the Vanishing Lines in Perspective, by G. Cumberland, Esq.; 3. Figures by 

 Dr. Herschell, exhibiting the singular Outline of the Disk of Saturn ; 4. Draw- 



. ings on a Quarto Plate, shewing the manner in which the Experiment of the 

 Invisible Girl is performed. 



I. Description of a very simple and useful Scale, for dividing the Vanishing 

 Lines in Perspective. In a Letter from G. Cumberland Esq. - Page 1 



II. An Essay on the Theory of Mixed Gases, and the state of Water in the At- 

 mosphere. By Mr. John Gough, Communicated by Dr. Holm. 4 



III. On the comparative Culture of Turnips. By Mr. William Watson. From 

 the Society of Arts, Vol. XXII. - - - - 14 



IV. On Comparative Micrometer Measures. In a Letter from the Rev. Dr. 

 J. A. Hamilton, Dean of Cloyne, to the Rev. J. Brinkley, F. R. S. From 

 the Irish Transactions, Vol. X. - - .-'' - 23 



V. Observations on the Metallic Composition for the Specula of reflecting Tele- 

 scopes, and the Manner of casting them ; also a Method of conununicating to 

 them any particular Conoidal Figure; with an attempt to explain, on Scientific 

 Principles, the Grounds of each Process : and occasional Remarks on the 

 Construction of Telescopes. By the Rev, James Little. From the Irish 

 Transactions, Vol. X. - - - - , 30 



VI. On the inverted Action of the Alburnous Vessels of Trees. By Thomas 

 Andrew Knight, Esq. F. R. S. - - - . ^ 



VU. The Invisible Lady, being an Explanation of the Manner in which thfrEx- 

 periment exhibited in London, by M. Charles and others, is performed. In 

 a Letter from a Correspondent. ' - - - - 69 



VIII. Mr. William Russel of Newman-street has offered Proposals for publishing 

 by Subscription, Two Engravings of the Moon in Piano. By the late John 

 Russel, Esq. R. A. - - - - . 71 



IX. Letter of Enquiry from a Correspondent, whether the Light and Heat 

 Company is intitled to Public Encouragement. - - 73 



X. Observations of Dr. Carradon, shewing that Water is not deprived of its 

 Oxigen by boiling. - - - . - 75 



XI. Scientific News, Royal Society. - - - - 79 



FEBRUARY 



