VI 
CONTENTS. 
XXII. Some Calculations cf the Number of Accidents or Deaths 
which happen in confequence cf Parturition ; and of the Paopcr- 
tion of Male to Female ■ Children , as well as of Twins, mxn- 
Jl rmis Productions, and Children that are dead-born ; taken f rom 
the Midwifery Reports of the W eft mi Lifter General Difpenfary : 
with an Attempt to afeertain the Chance of Life at different 
Periods, from Infancy to Twenty fix Years of Age; and like - 
wife the Proportion of Natives to the reft of the Inhabitants 
cf London. In a Letter from Robert Bland, M. D . Plyfi - 
ci an- Man- Midwife to the Weftminfter General Difpenfary, 
to Samuel Foart Simmons, M. D. F. R . S. p. 355 
XXII I. Account of a Child who had the Smallpox in the IVontb . 
In a Letter from William Wright, M. D. F. R. S. to John 
Hunter, Efq. F. R. S . p. 372 
XXIV. Natural Hi/lory of the Infect which produces the Gum 
Laeca. By Mr. James Kerr, of Patna ; communicated by 
Sir Jofeph Banks, P . R. S. p. 374 
XXV. Account of a Phenomenon obferved upon the I ft and of 
Sumatra. By William Madden, Efq,; communicated by Sir 
Jofeph Banks, P. R. S. p. 383 
XX VL Farther Experiments on Cold, made at the Macfarlane 
Obfervatory belonging to Glafgow College. In a Letter from 
Patrick Wilfon, M, A, to the Rev. Nevil Malkelyne, D. D. 
F. R. S. and Afronomer Royal. p. 386 
XXVII. A general Theory for the Menfuration of the Angle fub- 
iended by Two Ob jells, of which One is obferved by Rays after 
T wo Reflexions from plane Surfaces, and the other by Rays 
coming direStly to the Spectator s Eye . By George Atwood, 
M. A. F. R. S. p. 395 
XXVIII. An Account of the Ophidium barbatum linnei. By 
P. M, Auguftus Brouffonet, M. D. ; communicated by Sir 
Jofeph Banks, Bart . P. R. S . p. 436 
XXIX. A further Account of the Ufefulnefs of wafing the 
Stems cf Trees . By Mr. Robert Marfham, of Stratton, 
F. R . S. p. 449 
XXX. Hints relating to the Ufe which may be made of the Ta- 
bles of natural and logarithmic Sines, Tangents, &c. in the 
numerical Reflation of adfedled Equations . By William 
1 Wales, 
