276 ON THE COMBINATIONS OF 
pounds of one atom oil of vitriol* with one, two, 
and three atoms of water, have specific gravities 
above the mean, while the compounds of one 
atom of oil of vitriol with four, five, six, seven, 
eight, and nine atoms of water, have specific 
gravities below the mean. In the first case, 
there being a condensation, but in the second 
an expansion, and this expansion increasing with 
the quantity of water. 
I will here give a copy of his table, from which 
the results mentioned are to be observed. 
Next Water, [Specific Gravity]Specitic Gravity 
by Experiment.Jby Calculation. saat eek owt 
1 atom +1 atom | 1.8422 
“« Gioia 1.7837 | 1.7114 |+0.0723 or zz ? 
« 43 « | 41,6588 | 1.6158 |+0.0430 or a's.5 
Ae yt Ape 1.5593 | 1.5429 |+0.0164 or z's 
ea pe 1.4737 | 1.4854. |—0.0117 or 757 
ae 1.4170 | 1.4889 |—0.0219 or ¢'5.7 
ae oy al 1.3730 | 1.4006 |—0.0276 or s's-7 
MG ct 1.3417 | 1.3684 |—0.0267 or s'i.3 
“« 49 « 1.3105 | 1.3410 |—0.0805 or a5.5 
Cae he 1.2845 | 1.3174 |—0.0329 or a's 
* This term—oil of vitriol—is used as representing the com- 
pound of one atom anhydrous acid+ one atom water. 
