C ' v 3 
XVII. On an improved Reflecting Circle. By Joseph de 
Mendoza Rios, Esq. F. R. S. p. 363 
XVIII. Observations and Experiments upon Dr. James’s Powder; 
with a Method of preparing, in the humid Way, a similar Sub- 
stance. By Richard Chenevix, Esq. F. R. S. M. R. I. A. 
P- 375 
XIX. Case of a young Gentleman, who recovered his Sight when 
seven Tears of Age, after having been deprived of it by Cata- 
racts, before he was a Tear old ; with Remarks. By Mr. James 
Ware, Surgeon. Communicated by Maxwell Garthshore, 
M. D. F, R. S. p. 382 
XX. An Account of some Galvanic Combinations, formed by the 
Arrangement of single metallic Plates and Fluids, analogous 
to the new Galvanic Apparatus of Mr. Volta. By Mr. 
Humphry Davy, Lecturer on Chemistry in the Royal In- 
stitution. Communicated by Benjamin Count of Rumford, 
V. P. R. S. p. 397 
XXI. A Continuation of the Experiments and Observations on 
the Light which is spontaneously emitted from various Bodies ; 
with some Experiments and Observations on solar Light, when 
imbibed by Canton’s Phosphorus. By Nathaniel Hulrne, M. D. 
F. R. S. and A. S. p. 403 
XXII. Experiments on the chemical Production and Agency of 
Electricity. By William Hyde Wollaston, M. D. F. R. S. 
p. 427 
XXIII. Farther Observations on the Effects which take Place from* 
the Destruction of the Membrana Tympani of the Ear ; with an 
Account of an Operation for the Removal of a particular Species 
of Deafness. By Mr. Astley Cooper. Communicated by 
Rverard Home, Esq. F. R. S. p. 435 
