i CONTENTS. 



FEBRUARY, 1 805. 



Engravings of the following Objects: 1. Outlines of pendulous Meafures of 

 Time. By J. Whitley Boiwell, Elq. 2. Figure to illuftrate Mr. Gough's 

 Theory of the Augmentation of Sound by communicated Vibrations ; 3. PlarJ 

 for Captain Morthck's Method of furveying Hai hours and Coafts without In- 

 ftruinents, or by fuch as are extremely funple ; 4. A new Pocket Instrument 

 for mechanical Drawing in Perfpeclive. 



I. Experiments and Remarks on the Augmentation of Sounds. In a Let- 

 ter from Mr. Jchn Gough. ----- 63 



II. Obfervations on the different Degrees of Facility with which Maffes of the 

 fame Material admit of Changes in their Temperature ; with Applications 

 of the F:icts to the Construction of Pendulums, and Speculations upon 

 various new Forms of pendulous Regulatois of Time. In a Letter from 

 J. Whitley Bofwell, Ei'q. ----- 70 



III. Analytical Experiments and Obfervations on Benzoin. By Mr. William 

 Brande. Communicated by the Author. 82 



IV. On the Devitrification of Glafs and the Phenomena which happen during 

 its Cryftallization. By Dartigues. 89 



V. Letter from a Correfpondenr, relating to the apparent Reflection of Cold and 

 the Invention of the Telefcope, as noticed by Sir H. C. Englefield in laft 

 Month's Journal. - - - - - 92 



VI. Facts tending to decide the Queftion, at what Point of Temperature Water 

 pofiefles the greateft Denfity. In a Letter from Mr. John Dalton. 93 



TIL Analytical Experiments and Obfervations on Lac. By Charles Hatchett, 

 Efq. F. R. S. From chePhilol'ophical Tranfaaions for 1804. - 95 



VIII. A Simple and accurate Method of Surveying on Shore, with fuch Inftru- 

 ments only as are in every one's Poifeffion. By Captain J. Mortlock.— » 

 From the Author. - .• - - - - 105 



IX. Notice of nn Omiifion in Accum's Chemistry, of the direct Production of 

 Nitric Acid. By W. F. S. ----- J05 



X. On Galvanifm. By Mr. Charles Sylvefter - - 105 

 XL Reply to the Animadverficns and Experiments of C. L. on the Subject 



of the Horizontal Moon. By Mr. Ezekiel Walker. - - 10!* 



XII. Defcription of a Simple Inftrument for making correct Drawings from Na- 

 ture. By T. B.C. - - - - - 111 



XIII. Obfervations on Bafalt, and on the Transition from the vitreous to the 

 ftony Texture, which occurs in the gradual Refrigeration of melted Ba- 

 i'alt; with Come geological Remarks. In a Letter from Gregory Watt, Efq. 

 to the Right Hon. Charles Greville, V. P. R. S. From the Philosophical 

 Tranfactipns for 1804, p. 279, - - _ - - 113 



XIV. Account of the Method of bleaching Cotton, as praitifed at Salzburgh; 

 and the Art of giving a permanent Red to Cotton and Linen. By M. C. 

 Schoerbing. - . . _ _ _ _ 126 



XV. Report on an artificial Produaion of Camphor, announced by M. Kind. 

 Read to the Society of Pharmacy by Boullay. - - - 131 



XVI. Letter from Jofeph Hutlda, t, EUj. F. R. S. on the apparent Enlargement 

 of the Moojj at low Altitudes. ----- 13£ 



XVII. A Memoir on Milk and the Lactic Acid. By Cit. B. Lagrange. 141 



MARCH. 



