XVIII 



CONTENTS. 



IV. Direftions for making the bed Compofition for the Metals of Reflefl:ing 

 Telefcopes, and the Method of catling, grinding, poliOiing, and giving the 

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



p. 490 



V. Early Developement of the Antiphloglftian Theory of Combufhion. By 

 Robert Hooke - - - - - P- 497 



Mayow's Theory was publiihed in 1674, but Hooke's Micrographia, containing a detail of the 

 fame theory, was licenfed in 1664, and publilhed in the year following, 1665. 



VL Experiments and Obfervations on Shell and Bone. By Charks Hatchett, 

 Efq. F.R.S. - - - - p. 500 



VII. Experiments upon the Refiftance of Bodies moving in Fluids. By the Rev., 

 Sam. Vince, A.M. F.R.S. Piumian Profeflbr of Aftronomy and Natural Phi- 

 lofophy in the Univerfity of Cambridge - - p. 506. 



VIII. An Account of a Kettle for boiling inflammable Fluids. In a Letter 

 from Tho. P. Smith to Rob!. Patterfon - - ?• 5 14 



His contrivance confifts of a li^, fpout, or rim, into which the fltiid fpreads itfelf when it rifes by 

 ebullition. By this means the expanded part becomes cooled, and checks the boiling of the reft. 



IX. Letter from Mr. Davy, Superintendant of the Pneumatic Inftitution, to 

 Mr. Nicholfon, on the Nitrous Oxide, or Gafeous Oxide of Azote, on cer- 

 tain Fads relating to Heat and Light, and on the Difcovery of the Decom- 

 pofition of the Carbonate and Sulphate of Ammoniac - p. 5 15. 



X. Additional Remarks on the Hygrometer and Photometer. By Mr. John 

 Leflie - - -. - - P- S^^S 



XI. An Account of fome Experiments on the Fecundation of Vegetables. By 

 Thomas Andrew Knight, Efq. _ _ . p- 5^9 



Philofophical News, See. - - - - p. 522 



On the Soldering of Glafs.— Simple Method of obviating the Refiftance of the Air igainft the Pen- 



dulams of Clocks. — Diftillation by the Application of the cooling Mixture. 

 - 4 . 



MARCH 



