INDEX. 
Machine for meafuring a Ship’s Way at Sea, Experiments 
on it, by Mr. John Smeaton, p. 532. 
Mackenzie (Dr. Murdock ), Letter from Conjlantmople con- 
cerning the late Earthquake there, p. 8x9. 
Madeira , Continuation of the Account of the . Weather 
there, by Dr. Tbo. Heberden , p. 6 17. 
Mare , a large Calculus found in one, p. 800. 
Mars , his Parallax determined from Obfervations of the 
Rev. Dr. James Bradley , D. D. and the Abbe De la 
Caille , p. 512. * 
Martyn (Mr. John), Remarks concerning the Sex of Holly, 
P- 613. 
Mazeas (Abbe), Obfervations on the Electricity of the 
Air, p. 377. 
Melvil (Mr. T.), Letter to the Rev. Dr. James Bradley , 
with a Difcourfe concerning the different Refrangibility 
of the Rays of Light, p. 261. 
Mercury , Obfervations of his Tranfit over the Sun, May 6 , 
1753, by Dr. Rmx, and James Short, M. A. p. 
192. 
■ his Tranfit over the Sun, May 6 , 1753, obferv’d 
at Antigua, by Mr. IVilliam Shervington , p. 318. 
— Pheno- 
mena obferved therein, by. M. De Barr os, p. 361. 
Micrometer , of the Invention of a new one, by the late 
Servington Savery , Efq; in a Letter to Mr. James Short , 
p. 165. 
of Mr. Gafcoign' s Invention thereof, in a Let- 
ter from Dr. John Bevis to Mr. James Short , p. iqo. 
Aliles (Rev. Henry , D. D), Obfervations on the late fevere 
cold Weather, p. 510. 
Letter to John Canton, M. A; 
concerning the late hard Weather, p. 525. 
Aliller (Mr. Philip ), Letter to Mr. Wm. Wat Jon, concern- 
ing a Miftake of Profeffor Gmelin, concerning the Sphon - 
dylium vulgar e hirfutum , of C. B. p. 153. 
Mount aine (Mr. William), Extract of a Letter from Mr. 
James Dodfon to him, p. 273. 
Mount nine 
