CONTENTS. 
LXXVn. Obfervatiom on the Limax non cochleata 
Purpuram ferens, The naked Snail producing Pur- 
ple. By John Andrew Peyffonel, M. D. F. R. S. 
TranJJated from the French. p. 585 * 
LXXVIII. New Obfervatiom upon the Worms that 
form Sponges. By John Andrew Peyffonel, M. D. 
F. R. S. Tranfloted from the French. p. jgo. 
LXXIX. Account of an Experiment, by which it ap- 
pears, that Salt of Steel does not enter the Ladle al 
Ve(]els' } with Remarks. In a Letter to the Rev. 
Thomas Birch, D. D. Secret. R. S . By Edward 
Wright, M. D. ' p. 594. 
LX XX. A c DifJertation on the Antiquity of G/afs in 
■Windows. In a Letter to the Rev. Tho. Birch, 
D. D. Secret. R. S. By the Rev. John Nixon, 
M. A. F. R. S. p. 60 1. 
LXXXI. An Account of an extraordinary Cafe of 
the Efficacy of the Bark in the Delirium of a Fe- 
ver. By Nic s . Munckley, M. D. Phyfician to 
Guy’s-Hofpital, and F. R. S. p. 609. 
LXXXII. An Account of an Earthquake felt at 
Lingfield in Surrey, and Edenbridge in Kent, on 
the i\.th of January 1758. By James Burrow, 
Efq\ R. S. F. P. p. 614. 
LX XX II I. An Account of the Cafe of the Fir (l 
yoint of a Thumb torn off, with the Flexor Ten- 
don in its whole Extent torn out. By Robert 
Home, late Surgeon to the Thirtieth Regiment of 
Foot , and Surgeon at Kingfton upon Hull. In a 
Letter to John Pringle, M. D. F. R. S. p. 617. 
LXXXI V. An Account of the late Difcoveries of 
Antiquities at Herculaneum, and of an Earth- 
quake there ; in a Letter from Camillo Paderni, 
Keeper 
