H CONTENTS. 



JULY, 1807. 



Engravings of the following Objects: I. Theory of Looming or Horizontal Re- 

 fraction. 2. Mr. Salmon's Specimens of good and bad Pruning of Fir Trees. 



I. On Looming, or Horizontal Refraction. By a Correspondent 1 153- 



II. Remarks on Pruning Fir Trees ; with an Engraving, to explain the Advan- 

 tages of the Method recommended. By Mr. Robert Salmon, of Woburn, 

 Bedfordshire - - - - - 157 



III. Abstract of a Memoir read at the Meeting of the fifth Class of the Institute, 

 September 29th, 1806, by Mr. Laplace, on the apparent Attraction and Re- 

 pulsion of small Bodies floating on the Surface of Liquids - 1G4 



XV. Abstract of a Memoir on the Adhesion of Bodies to the Surface of Fluids, 

 read at the Sitting of the first Class of the Institute, Nov. the 24th, 1806. 

 By Mr. Laplace " - - - - 160 



V. Account of a Loom to be worked by Steam or Water. By Mr. John Austin, 

 of Glasgow - - - - - 175 



VI. Observations and Experiments respecting the Art of making Copies of Writ- 

 ten Paper by Pressure. ByR.T. - - - 178 



VII. Of Violet Purple, and the different Tints that may be derived from it. By 



John Michael Haussman - - - - 182 



VIII. On Cast Iron. By Professor Proust - - 185 



IX. On Filtering Stones, and the Method of determining the specific. Gravity 

 of Substances with large Pores. By Mr. Guyton - - 190 



X. Report on a sculptured Head of Flint, with a Covering of Calcedony, made 

 to the Physical and Mathematical Class of the Institute, March 31, 1806. 

 By Mr. Guyton - - - - - 195 



XL Experiments on Double Vision. By Dr. Haldat, Secretary to the Academy 



of Nancy - . 201 



XII. Experiments on the Effects produced by a high Temperature on the Ani- 

 mal Economy. By F. F. Delaroche, of Geneva - - 215 



XIII. Observations on the Two different Methods of preparing Acetic Ether, 

 By Mr. Henry, Professor in the School of Pharmacy at Paris - 219 



XrV. Inquiries concerning the Oxidations of Iron. By Mr. Darso 221 



XV. Scientific News - - 227 



AUGUST, 



