CONTENTS. 
XV. A further Account of the fame Cafe : in a Let- 
ter to the Right Honourable the Lord, Cadogan, 
F. R. S. from the Rev . William Henry, £). D. 
F. R. S, p. 92. 
XVI. An Account of the Comet feen in May 1759. 
By J. Be vis. M. B. p. 93. 
An Account of the fame Comet : By Nicolas 
Munckley, Efq ; Communicated by Nicolas 
Munckley, M. D. F. R. S. p. y>4. 
XVII. A Catalogue of the Fifty Plants from Chel- 
fea Garden, prefented to the Royal Society by the 
worfhipfal Company of Apothecaries , for the Tear 
1758, purfuant to the DireStionof Sir HansSloane, 
Baronet , Med. Reg. & Soc. Reg. nuper Prcefes , by 
John Wilmer, M.D. clarif. Societatis Pharma - 
cent. Lond. Socius , Hort. Chelfean. Prafebhis, & 
Prceledlor. Botanic. p. 96. 
XVIII. An experimental Enquiry concerning the na- 
tural Powers of Water and Wind to turn Mills , and 
other Machines, depending on a circular Motion. 
By Mr. J. Smeaton, F. R. S. p. 100. 
Part I. Concerning Underfoot Water-Wheels. 
p. 101. 
Part II. Concerning Overfhot Wheels . p. 124. 
Part III. On the ConfruLtion and Ef'ebls of Wind- 
mill-Sails . ' p. 138. 
XIX. An Account of the remarkable Alteration of 
Colour in a Negro Woman : In a Letter to the Re- 
verend Mr. Alexander Williamfon of Maryland, 
from Mr. James Bate^ Surgeon hi that Province. 
Communicated by Alexander RufTel, M. D. F. R. S. 
P- 175- 
XX. The Cafe of a paralytic Patient cured by an elec- 
trical Application, inclofed in a Letter from Dr. 
A 2 Himfel, 
