'" ' CONTENTS xix 



MARCH 1800. 



Engravings of the following Objeds : The Air Furnace of Cit. Leccur; and^ 

 2. An Improvement in Mr. Clofe's Tallow Lamp. 



I. Direftions for making the beft Compofition for the Metals of Refleding 

 Telefcopes, and the Method of cafhing, grinding, polifhing, and giving the 

 great Speculum the true parabolic Figure. By the Rev. John Edwards B. A., 

 (Concluded from p. 497) - - - P- 5^5 



II. Experiments and Obfervations on Shell and Bone. By Charles Hatchett, 

 , Efq. F. R. S. (Concluded from p. 506) - - p. 529 



III. Some Account of the Elaftic Gum Vine of Prince of Wales's Ifland, and of 

 Experiments made on the milky Juice which it produces : with Hints refped- 

 ing the ufeful Purpofes to which it may be applied. By James Howifon, Efq. 



P- 534 



IV. Mifcellaneous Obfervations relative to the Weftern Parts of Pennfylvania, 

 particularly thofe in the Neighbourhood of Lake Erie. By Andrew Ellicott 



P- 539 ' 



V. Account of the Pearl Fifliery in the Gulph of Manar, in March and April, 

 1 797. By Henry J. Le Beck, Efq. - - p. 542 



VI. Defcription of the Air Furnace of Cit. Lecour - p- 546- 



VII. On the Lamp for Tallow, and the Combuftion of that Material. By Mr., 

 ^"illiam Clofe - _ - p. 547^ 



