CALCULATIONS TO ASCERTAIN THE TRACT 26.

C6

of them all, as compared to water, after the manner of a com-mon table of specific gravities. And the numbers expressingtheir relative densities, in respect of water, will be as hereannexed, supposing thedensities of the planets, as comparedto each other, to be as laid down in Mr. De ja Lande’s as-tronomy.

Water . .

. 1

The Sun

•

Mercury ;

• 10 |:

Venus . .

■ 6t

The EaVth .

; 5

Mars . . .

. 3f

The Moon .

. 3 t V

Jupiter . .

• H

Saturn . .

• IT

Thus then we have brought to a conclusion the computa-tion of this important experiment, and, it is hoped, with noinconsiderable degree of accuracy.—But this is the first ex-periment of the kind, which has been so minutely and cir-cumstantially treated; and first attempts are seldom so perfectand just, as succeeding endeavours afterwards render them.And besides, a frequent repetition of the same experiment,and a coincidence of results', afford that firm dependanceon the conclusions, and satisfaction to the mind, which canscarcely ever be obtained from a single trial, however care-fully it may be executed. For these reasons it is to be wished}that the world may not rest satisfied barely with what hasbeen done in this instance, but that they will repeat the ex-periment in other situations, and in other countries, with allthe care and precision that it may be possible to give it; tilla uniformity of conclusions shall be found, sufficient to esta-blish the poiiit in question, beyond any reasonable probabilityof doubt. What has been already done in the present case,■will render any future repetition more easy and perfect. Butimprovements may doubtless be made, perhaps both in themode of computation, and in the survey; in the latter es-pecially there certainly may. Some improvements of this kind