tv CONTENTS- 
XX. Obfirmth^of ih^dTranfir <f Mercury overthe SmHDifc t 
made at Louvain, in the Netherlands, May 3, 1786. By 
Nathaniel Pigott, Ffq . F. R. S. p. 384 
XXL Obfervation of the late Tranft of Mercury over the Sun , 
obferved by Edward Pigott, Efq. at Louvain in the Nether- 
lands ; communicated by him in a Better to the Rev. Nevil 
Mafkelyne, D. D. F. and Aflronomer Royal. p. 389 
XXII. Additional Objervations on making a Thermometer for 
meafuring the higher Degrees of Heat. By Mr. Jofiah 
Wedgwood, F. R. S. and Potter to Her Majefy. p. 39 q 
XXIII. The Latitude and Longitude of York determined from a 
Variety of AJlronomical Objervations ; together with a, Recom- 
mendation of the - Method of determining the Longitude of 
Places by Obfervations of the Moorts Tranft over the Meri- 
dian . Contained in a Letter from Edward Pigott, Efqi 
to the Rev. Nevil Mafkelyne, D. D. F. R. S. and Afironomer 
Royal. p. 409 
XXI V. Advertifement of the expected Return of the Comet of 
1532 and 1661 in the Tear 1788. By the Rev , Nevil 
Mafkelyne, D. D. F. R. S. and Afironomer Royal. p. 426 
XXV. A new Method of finding Fluents by Continuation. By 
the Rev, Samuel Vince, A . M. F. R. S. p. 432 
XXVI. Conjectures relative to the Petrifactions found in St, 
Peter’s Mountain , near Maeftricht. By Petrus Camoer, 
M. D. F. R. S. p.443 
XXVII. Catalogue of One Thoufand new Nebula and Clufiers of 
Stars. By William Herfchel, LL.D . F. R. S. p. 457 
XXVIII. Invefiigation of the Caufe of that IndifiinCineJs of 
Vifion which has been afcribed to the final tnefs of the Optic 
Pencils . By William Herfchel, LL.D.F.R.S. p. 300 
