iv C O isr TIE NTS. 
Academies^ and ProfeJJor of Natural Pbilofophy,^c. at 
, I lavre de Grace. p. 207 
XXI. Account of the Sea-Cow, and the life made of it. 
By Molineux Shiildham, Efquire, Communicated by 
the Hon. Dairies Barlrington, F. R. S. p. 249 
XXII. 'Phe Procefs of making Ice in the Eaft Indies. By 
Sir Robert Barker, F. R. S. in a Letter to Dr. 
Brocklefby. p. 252 
XXIII. Of the Houfe-Swallow, Swift, and Sand-Martin. 
By the Rev. Gilbert White, in L’hree Letters to the Hon.. 
Daines Barrington, F. R. S, p. 258 
XXIV. Account of a Machine for raifing Water, executed 
<7/ Oulton, m Chefliire, in 2. In a Letter fro 7 n- 
Mr. John Whitehnrft to Dr. Franklin. p. 277 
XXV. ExtraSi of a Letter from Mr. Lexel to Dr. Morton.. 
Dated PttQvibmg, June 14, 1774. p. 280^ 
XXVI. An Inveftigation of a general "Theoreiti for finding 
the Lettgth of any Arc of a Conic Hyperbola, by Means 
of Lwo Elliptic Arcs, with fome other new and ufeful 
"Pheorems deduced therefrom . By J ohn L anden, F.R.S. 
p. 283. 
XXVII. Obfervations made at Chiflehurft, in Kent, in the 
Tear 1774. By the Rev. Francis Wollafton, LL.B., 
F.R.S. p. 290 
XXVIII. Of Triangles defer ibed in Circles and about them.. 
By John Stedman, M. D. p. 296 
XXIX. De Polygonis Area vel Perimetro maximis et mini- 
mis, inferiptis Circulo, vel Circulum circumferibentibus^ 
AudloreS. Horlley, LL. D. R. S. Sec, • p- 301 
3 XXX. An 
