I 
CONTENTS 
VOL. 
O F 
LXXIII. Part IL 
XVII. the proper Motion of the Sun and Solar Sv/lem; with 
an Account of feveral Changes that have happened 
among the fixed Stars fince the Time of Mr. Flamftead. By 
William Herfchel, Efq . F . R . S. page 247 
XVIII. Some Experiments upon the Ochra friabilis nigro 
fufca oj Da Cofla, Hiff . Fojf. p . 102.; and called by the 
Miners of Derbylhire, Black Wadd. By Jofiah Wedgwood, 
F. R . *9. p. 284. 
XIX. Memoir e fur la Manlere de preparer , avec le rnolns de perte 
pojjible , le Sel jufible d' Urine blanc, et pur y et V Acide phofpho- 
rlque parfaitement tranfparent . By the Duke de Chaulnes, 
F . R . S. prefented by Sir Jofeph Banks, Bart. P.R.S. p. 28 8 
*XX. Experiments for afcertaining the Point of Mercurial Con- 
gelation. By Mr. Thomas Hutchins, Governor of Albany* 
Fort, in Hudfon’s Bay. P-*3°3 
Kk 2 
XX. Ob 
