of the Moon with a Sextant , or Reflecting Circle . 63 
Moon 23' 30* must be near the end of the eclipse, since both the 
time and the quantity of the enlightened part of the Moon con- 
tinue augmenting ; nevertheless the time of this measurement is 
21 h 0' 13".9, i- c. less than 21 h 20' 45", which is evidently ab- 
surd. This error of the text leaves no other alternative than to 
deduct the time for which the observation is calculated from 
that of the full Moon, which gives us 19 h 27 ' 28",8. Another 
evident error of the text is detected as follows ; 
Mean Time at Paris, 
21 h 
O' 13". 9 according to the text, 
... Ibague, 
15 
50 54.9 
Longitude in Time, 
5 h 
9' 19" 
instead of 
5 
9 39 given in the text. 
Error, 
0 h 
0' 20" 
Art. VIII. — Remarks on the Increase of the Population of the 
United States and Territories of North America , with Ori- 
ginal Tables , deduced from the American Population Re- 
turns , to illustrate the various Rates of Increase in the White 
Popidation and Slaves , and also the comparative degrees in 
which Agriculture , Commerce , and Manufactures prevail . 
By George Harvey, Esq. M. G. S. M. A. S., &c. (Conti- 
nued from Vol. VIII. p. 339.) 
Slave Population. 
Every lover of humanity necessarily feels an interest in the. 
condition of that class of our fellow men who are doomed to 
spend the long range of a miserable existence in a state of slave- 
ry. The heart sympathises with their misfortunes, and we ea- 
gerly embrace every opportunity, which is likely to throw even 
but a feeble and uncertain light on their unhappy condition. 
The returns of the slaves contained in the American Population 
Tables, are probably the only sources from which any satisfac- 
tory information can be drawn, to illustrate this very important 
subject. 
It has been already remarked, that in the enumerations of the 
American people, prior to the census of 1820, the slaves were 
thrown into one mass, without any distinction as to their sexes, 
