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XXII. Some Calculations of the Number of Accidents or Deaths 
which happen in confequence of Parturition ; and of the Propor- 
tion of Male to Female Children , as well as of Twins, mon - 
Jlrotis Productions , and Children that are dead-born ; taken from 
the Midwifery Reports of the Wefimmfter General Difpenfary : 
with an Attempt to afcertain the Chance of Life at different 
Periods , from Infancy to Twenty fix Tears of Age ; and like- 
wife the Proportion of Natives to the ref of the Inhabitants 
of London. In a Letter from Robert Bland, M. D. Phyfi - 
cian-Man- Midwife to the Weftminfter General Difpenfary* 
to Samuel Foart Simmons, M. D . F. R . S. 
Read May iq, 1781* 
DEAR SIR, 
T HE great advantage of hofpitals and other fimilar in hit up- 
turns, in improving and difleminating medical know- 
ledge, is generally acknowledged ; but there are other purpofes, 
they feem equally calculated to anfwer, which, though fubor- 
din ate to the former, may yet deferve atten tion, as they may 
throw light upon, and perhaps finally determine, certain poli- 
tical queftions, about which various opinions are at prefent 
entertained. Thus, though it is known that this city contains 
perfons from various countries, and that a very fmall por- 
tion of its inhabitants are natives ; yet the proportion which 
the latter bear to the aliens can at prefent only be gueffed at.. 
But 
