The C O NTE NTS. 
refe 7 nhled a Water-Spout, communicated to 
the Prefident by Tho. Barker, Ejq; p. 248 
XIV. An Enquiry into the original State and 
Properties of Spar, and Sparry Productions, 
particularly the Spars or Cryftals found 
in the Cornifh Mines , called Cornifh Dia- 
monds. In a Letter to Emanuel Mendez 
da Cofta, Efq\ F. R. S. fro?n the Rev. Mr. 
Wm. Borlace. . p. 250 
XV. A Defcription of the Great Black Wafp, 
from Penhlvania, as communicated from 
Mr. John Bartram to Mr. Peter Collinfon, 
F. R. S. p. 278 
XVI. An Obfervation of an Eclipfe of the 
Moon> Dec. 1 2. 1 749. made at Earith, near 
St. Ives, in Huntingdonshire, by Mr. Wm. 
Elftobb, jun. com?nuicated in a Letter to 
Martin Folkes, Efq\ Pr. R. S. p. 280 
XVII. A Catalogue of the Eclipfes of Jupi- 
ter’s Satellites^?' the Tear 1751. by James 
Hodgfon, F.R.S. and M after of the Royal 
Mathematical School in ChrifPs-Hofpita], 
London. p. 282 
XVI II. A Letter from the Widow of the late 
Mr. John Senex, F. R.S. to the Prefident, 
concerning his large Globes . p. 290 
