F. W. Clarke—lIodates of Cobalt and Nickel. 283 
Hyposulphites, measured by Mr. L. T. Richardson. 
CaS,0,, 6H,O, in fine crystals, 1°8715, 13°5°, and 1°8728, 16°. 
SrS Kn Be 6H, O, in good crystals, 21566, 2°1991, both at 17° 
BaS, ey 0, ’ precipitated, 3°4461, 16° and 3° 4486, 18°. 
Mr. Ri chardson also made a determination for potassium sul- 
phate, getting 2°653, 18°. This agrees closely with Petters- 
son’s figure, 2°66. 
Tungstates, examined by Mr. J. L. Davis. The sodium salt 
was a commercial product, and was therefore first analyzed to 
be certain of its character. The nickel and barium salts were 
eam by the well-known method of fusion. 
a,WO,, 4°1743, 20°5°, and 471833, 18°5°. 
Ne Wo. , 2H,0, i "2588, 175°, and 3°2314, 19°. 
BaWo,, 0035, 13°5°, and 50422, 15°. 
NiWwo? . 8846, 20° 5°, and 6°8522, 22°. 
Molyhdates prepared and determined by Mr. F. O. Marsh. 
BaMoO,, 4°6589,17°5°, and 4°6483, 19°5°. 
SrMo,, "4: 1554, 20°5°, and 4°1348, 21°. 
Mr. C. A. ss ae worked upon phosphates and hypophos- 
phites, as follow 
Barium iia er ee BaP,H,0,, H,O, 2:8718, 10°, and 2-8971, 
se es 
Magnesium 5 buat MgP.H,0,, 6H,O, 1°5886, 12°5°, and 
15681, 
Sodium metaphosphate NaPO,, ee by igniting microcos- 
mic salt, 24756, 19°5°, and 2°4769 
Potassium metaphosphate, KPO, babel by pigee f the mono- 
potassium ortho-salt, 2°2639, ‘and 2°2513, both at 1 
No other hypophosphites or metaphosphates have as - had 
their densities determined. 
 amevaneg orthophosphate, anhydrous, Na,PO,,2°5111, 12°; 2°5362, 
Sodium, p pC Re fhe 10H,O, 1°7726, 21°. Playfair 
ngs e found 1 
The same salt, dehydrated by ignition, 2°3851 and 2:3618, 
17°. Schréder’s determination makes the salt 2584, a widely 
different figure. 
The following series of chromates was prepared and exam- 
ined by Miss E. O. Abbot. 
sagas chromate, MgCrO,, 7H,0, finely crystallized, 1°7613 at 
16°. For this salt Bodeker found 1 -75,and Kopp 1°66. The 
higher result is more probable. In her work on this com- 
pound Miss Abbot also determined another important fact, 
namely that, like the corresponding sulphate, magnesium 
