CONTENTS of NUMBER Cit. 
Page 
XXXII. A Memoir on the best Method of measuring Time —  ; 
AY at Sea, which obtained the double Prize adjudged by the Royal 
| Academy of Sciences; containing the Description of the Lon- 
SS gitude Watch presented to His Majesty the 5th of August 
“A 1766: By M. Le Roy, Clock-maker to the King. - Trans- 
} eee from the French by Mr. T.S. Evans, F. L.S., of the 
N Royal Military Academy, Woolwich - 
XXXIV. Memoir ape lan and fossil | Elephants By 
M. Cuvier 
XXXV. Memoir upon a Prades eenlareal in the ci- aegacit 
Maconnais of France, to avert Showers of Hail, and to dissi- 
MW pate Storms. By M. Lescuevin, chief Commissary for Gun- 
eee and Saltpetre at Dijon - - - 
XXXVL_ On Canal'Track-Boats. By Robertson Bu- 
Ke } cHANak, Esq. Civil Engineer, Glasgow 
XXXVII. Analysis of the Substance known by the Name 
of Turquoise. By M. Bourtron Lacranee » = 
sty  XXXVIII. The Bakerian Lecture on the Force of Perens- 
zsion. By Witttam Hype Woutaston, M.D. Sec. R.S, 
* XXXIX. History of anes for the Year tBO5: By 
JEROME De LaLanpDeE 
XL. Report of Surgical Chak in the Figshaty Ditpsasary 
Hfrom the rst of September to the ist of November 1806; 
4 vith Observations on two Cases of Hernia which proved fatal. 
~ Communicated by Jonn ‘Taunton, Esq. Surgeon to the 
@ City and Finsbury Dispensaries, and Lecturer on Anatomy, 
\ Surgery, &c. - - - - - 
} XLI. Thirty-third Communication from Dr. Taornron, 
relative to Pneumatic Medicine - ‘2 
XLIF. Notices respecting New Publieations 
XLII. Proceedings of Lenses Societies _ 
Extraordinary Paahonitohins Art of POSNER Comet— 
Lectures—List of Patents for New Inventions, &c. ~~ 2]6—288 4 x 
*,* Communications fer this Work, addressed to the Editor, at i 
No. i, Carey-street, Lincoln’s Inn, Sill meet with every attention, \ 
pas wa 
MECHANICS. : 1 
* SKETCH of the Peneeeriidad ADVANTAGES of RE PAL 
TENT GRAVITATED SAILS for WINDMILLS, ~ 
By W.S. HESLEDEN, Esq.of Barton upon Humber. NS 
Printed for the Author; and sold by J. Taylor, at the Architectural Boe : 
rary, No. 59, High Holborn. 
Where may be had, lately published in 8vo, price 10s. 6d. in boards, 
A Treatise on the feeru of WHEELS, PINIONS, &e.3 demonstrating the 
best Forms which can be given:them for the various Purposes of Machinery, f\ A 
such as Mill-work, Clock-work, &c. and the Arts of Finding their Numbers: 
‘Translated from, the French of M. Camus; with Additions. finn 
Illustrated by Fifteen large Plates, : 
