C O N T E N T S. vii 



Secretary of the Imperial Academy of Pe*er'fbnrgh ; 

 in a Letter to Charles Morton, M. D. Sec. R. S. 

 & Acad. Imper. Petroburg. &c, Soc. p. 69 



X. A Letter to the Rev. Mr. Mafkelyne, Afronomer 

 Roy ah F* B.. S. accompanying a new Chart of the 

 Red Sea, with two Draughts of the Roads of Mocha 

 and Judda, and feveral Obfervations made during a 

 Voyage on that Sea, by Capt. Charles Newland. 



P- 77 



XI. Remarks and Obfervations made on board the Ship 



Kelfall, on a Voyage to Judda and Mocha, in 1769, 

 by the fame. p. 79 



XII. An eafy Method to diftill frefi Water from Salt 

 Water at Sea ; by the fame. p. 90 



XIII. Obfervations on the milky Appearance of jome 

 Spots of Water in the Sea; by the fame. p. 93 



XIV. A Letter from Mr. Peter Dollond, to Nevii 

 Mafkelyne, F. R. S. and Aflronomer Royal-, de- 

 fcribifig fome Additions and Alterations made to 

 Hadley's Quadrant, to render it more ferviceab/e at 

 Sea. P* 95 



XV. Remarks on the Hadley's ££iiadrant, tending 

 principally to remove the Difficulties which have 

 hitherto attended the Ufe of the Back-obfervation^ 

 and to obviate the Errors that might Wife from a 

 Want of Paralle/ifm in the two Surfaces of the 

 Index-G/afs, By Nevil Mafkelyne, -R R. S. Afro- 

 nomer Royal. P* 99 



* XV". Account of the Irruption of Sol way Mofs on 



December 16, 1772 ; in a Letter from Mr, John 



Walker, to the Earl of Bute, and communicated by 



his Lordfhip to the Royal Society. p. 123 



i- 



XVI, A 



