VI 
C O N T E N T S. 
XXII. Some Calculations of the Number of Accidents or Deaths 
"which happen in confequence of Parturition ; and of the Paopor- 
tion off Male to Female Children , as well as of Twins, mon- 
jircus Productions, and Children that are dead-born ; taken from 
toe Midwifery Reports of the Weft mm fie r General .Dilpenfary : 
with an Attempt to a [certain the Chance, of Life at different 
Periods, from Infancy to Twenty fix Tears of Age ; and like 
wife the Proportion of Natives to the reft of the Inhabitants 
of London. In a Letter from Robert Bland, M. D. Phyfi- 
c i an- Man-Midwife to the Weftminfter General Difpenfary, 
to Samuel Poart Simmons, M. D. F. R . S. p. 355 
XXIII. Ac count of a Child who had the Small-pox in the IVomb. 
hi a hater from William Wright, M. D. F. R. S. to John 
Hunter, Efq. F . R. S. p. 372 
XXIV. Natural Hiflory of the InfeB which produces the Gum 
Lacca. By Mr. James Kerr, of Patna ; communicated by 
Sir Jofeph Banks, P. R. S. p. 374 
XXV. Account of a Phenomenon obferved upon the Ifland of 
Sumatra. By William Marfden, Efq..', communicated by Sir 
Jofeph Banks, P. R. S. p. 383 
XXVI. Farther Experiments on Cold, made at the Macfarlane 
Obfervalory belonging to Glafgdw College. In a Letter from 
Patrick Wilfon, M. A. to the Rev . Nevil Malkelyne, D. D . 
F. R. S. and Afronomer Royal. • p. 3 $6 
XXVII. A general Theory for the Menfuration of the Angle fub- 
tended by Two Objects, of which One is obferved by Rays after 
Two RefeBions from plane Surfaces , and the other by Rays 
coming direBly to the SpeBators Eye. By George Atwood, 
M. A. F, R. S. P* 395 
XXVIII. An Account of the Ophidium barbatum linnei. By 
P. M. Augu ftus Brouffonet, M. D. ; communicated by Sir 
Jofeph Banks, Bart. P. R. S. p. 436 
XXIX. A further Account of the Ufefulnefs of wafting the 
Stems of 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 adfeBed Equations . By William 
1 Wales* 
