The CONTENTS. 
XXII. An Account of a new Purging Spring difcovered at Dulwich 
in Surrey, by Mr. John Martyn, F. R. S. Prof. Botan. Cantab. 
837. 
XXIII. An Obfirvation of the Lights feen in the Air, an Aurora 
Auftralis, on March 18.1738-9. at London, by Cromwell Mor- 
timer, M. D. Seer, to the Royal Society. 839. 
XXIV. A Letter from Mr. John Martyn, F. R. S. Prof. Botan. 
Cantab, to John Machin, Efj; Sec r. R. S. ^WProf. Aftron. Gref- 
ham. concerning an Aurora Auftralis feen March 18. 1738-9 at 
Chelfea, near London. 840. 
XXV. Part of a Letter from the Reverend Mr. Timothy Neve, 
Secretary of the Gentlemens Society at Peterborough, to Dr. Mor- 
timer, Member of the fame Society, and Seer. R. S. concerning the 
fame Aurora Auftralis. 843. 
XXVI. A Defcription of a Catheter, made to remedy the Incojiveni- 
encies , which occafoned the leaving off the High Operation for the 
Stones by Archibald Cleland, Surgeon to General Wade’s Regiment 
o/Horfe. - 844. 
XXVII. A Defcription of Needles made for Operations on the Eyes, 
and offome Inftruments for the Ears, by the Same. 847. 
XXVIII. Part of a Letter from % Mr. Stephen Fuller, Fellow of Tri- 
nity College, Cambridge, to his Father John Fuller, Efqy fenior , 
F. R. S. concerning a violent Hurricane in HuntingtonOiire, Sept. 8. 
1741. Communicated by Sir Hans Sloane, Bart, late Pr. R. S. 
851. 
XXIX. Extraff of Letters from Mr. T. Sympfon, to Brown Willis, 
Efifo Member of the Society of Antiquaries, and to James Weft, 
Efq; Member of the Sarne^ and Treaf. R.S. by the Publifher, con- 
cerning the Remains of a Roman Hypocauftum or Sweating- 
Room, difeovered under-ground at Lincoln, Anno 1739. 85 -y. 
XXX. Accounts of a Capricorn Beetle, found alive in a Cavity 
within a found Piece of Wood , and of the Horn of a Fifh [truck 
fever al Inches into the Side of a Ship j by C. Mortimer, M. D. Seer. 
R.S. 861. 
XXXI. Abf raffs of the original Papers communicated to the Royal 
Society by Sigifmond Auguftus Frobenius, M. D. concerning his 
Spiritus Vini AEthereus: Colleffed by C. Mortimer, M.D. Seer. 
R.S. 864. 
XXXII. An Account of the Fire-ball feen in the Air, and of the 
Explofion heard , on Dec. 11. 1741 by the Right Ho?iourable the 
Lord Beauchamp, near London. 870. 
XXXIII. A Letter from John Fuller, jun. Efq^ F. R. S. to Sir Hans 
Sloane, Bart, late Prefident of the Royal Society, concerning 
the fane Meteor, in Suflex. 871. 
XXXIV. A 
