[ 54 6 3

I have therefore computed the gravities anew, togetherwith the gravity which each mixture gives for the platina.The first column, in each of the following tables, containsthe proportions of the two metals in the several mixtures,the loss sustained in fusion, where there was any, beingdeducted: as platina itself suffers no diminution in the fire,it is from the quantity of destructible metal mixed with itthat this deduction is made. The second column containsthe specific gravities of the mixtures as found by experi-ment, and the third their gravities by calculation supposingthe plasmas gravity to be 17: in the fourth is shewn thedifference between the experimental and computed gravi-ties, with the marks -j- or — according as the former isgreater or less than the latter. The last column gives thegravity of platina deduced on Mr. Scheffers principle fromeach of the mixtures.

Specific Gravity

Platinas

By Exper.lBy Calcul.

Difference

Gravity

GOLD

19,285

resulting

Platina 1, Gold 2 - -

18,378

18,458

,080 —

16,797

Platina 1, Gold 3 - -

18,613

18,658

>° 35 "

16,852

Platina 1, Gold 5 - -

l8,8l2

I 8,862

,050 —

16,759

Platina 1, Gold 11 - -

18,835

19,071

,236 —

14,988

Platina 1, Gold 15 - -

18,918

19,124

,206 —

H, 7 2 3

Platina 1, Gold 23 - -

19,089

1 9> 1 77

,188-

15,481

Platina 1, Gold 31 - -

19,1 28

19,204

,076 —

15'273

Platina 1, Gold 47 - -

19,262

19,231

,031 +

18,71 I

j Platina i, Gold oc - -1 u

19,273

19,258

,0154-118,214

As the experiments with gold had not come toMr. Scheffers hands when he wrote his paper, he was inhopes, that when such experiments should be made, theywould give platinas gravity with certainty; gold being

free