460 
Thorina. 
phate of potash, lets fall no pre- 
cipitate. 
Insoluble in hydrate of potash. The same. 
Soluble in alkaline carbonates. The same, but in much greater 
quantity. 
Becomes by calcination difhi- 
cult of solution. 
Colonel Beaufoy’s Magneiical 
(JunE, 
Zirconia, 
tirely precipitated. Hf this is 
done in the cold, the precipitate 
is entirely soluble in water, 
When heated to redness, be- 
comes insoluble. 
These two earths exhibit the same properties before the blow-pipe.* 
I have reason to presume that the thorina found in the mineral 
from Korarvet, which I analyzed, was in the state of a silicate, 
similar to gadolinite ; but that the portion found at Finbo was in a 
state of combination with fluoric acid. 
“Articite VIII. 
Magneiical and Meteorological Observations. 
By Col. Beaufoy, F.R.S. 
Bushey Heath, near Stanmore. 
Latitude 51° 27’ 42” North. 
Magnetical Observations, 1817. — Variation West. 
Longitude west in time 1/ 20:7”, 
Morning Observ. Noon Obsery, Evening Obsery. 
Month. ; 
Hour. | Variation. Hour. Variation. | Hour. Variation, 
April 18} 8h 45’|.24° 30’ 51”) 1h 45! | 24° 44’ 38” 6h 45’| 240 35’ 93” 
19| 8 45 | 24 30 33 1 45 | 24 44 54 6 A5 | 24 35 AT 
20| 8 45) 24 31 05 1 55 | 24 42 00 6 45 | 24 35 13 
21; 8 45) 24 30 08 1 45 | 24 44 58 6 45] 24 35 36 
22) 8 45 | 24 33 53 1 45 | 24 42 16 6 40| 24 36 18 
23| 8 40| 24 32 32 1 45 | 24 43 A8| 6 451] 24 35 50 
94; 8 45 | 24 33 Qi 1 45 | 24 46 58 6 45} 24 37 06 
25; 8 40] 24 $2 57 1 45 | 24 45 $1 6 45] 24 35 37 
26| 8 45] 24 32 46 1 45 | 24 43 06 6 45 | 24 33 26 
27; 8 45 | 24 34 14 1 45 | 24 45. 40 6 45 | 24 35 33 
28) “8 ,45.| 24 +29. 27 1 45 | 24 40 08 6 45 | 24 33 37 
29; 8 3 24 30 39 1 55 | 24 40 37 6 45 | 24 34 Ol 
30} 8 45) 24 30 Qi 1 55 | 24 4¢ 00}; — —|]— — — 
) 
pti i gs 44) 24 31 52 | 1 46/24 44 43 | 6 40| 24 35 58 
enth, 
* YT have read somewhere that zirconia gives a blue colour with cobalt, and 
hoped that this would furnish a ready method of distinguishing the two earths: but 
the blue colour does not appear except when the zirconia contains an alkali. When 
pure Zirconia is obtained by expelling the acid from sulphate of girconia by heat, 
it does not enter into fusion nor become blue with cobalt, but greyish-brow2. 
