Mr. G. W. Brown on Drift Weed Kelp from Orkney. 213 



Alumina. ^"^"f- 



per cent. 



400 grains gave '740 -185 



500 " " -500 -100 



Mean -1425 



Determination of Lime. — To the liquid from which the phosphate of 

 lime had been separated, oxalate of ammonia was added, when oxalate 

 of lime fell. This precipitate being washed and heated to redness was 

 converted into carbonate. 



Carbonate of Lime. Lime. Lime, per cent. 



500 grains 38-85 21-755 4-351 



Estimation of Magnesia. — Having removed the lime by filtration, the 

 magnesia was precipitated by means of phosphate of soda and ammonia, 

 as the ammonia phosphate of magnesia, which, when heated, was converted 

 into the diphosphate of magnesia 2 (Mg 0) P O5. 



2 (Mg 0) P Oi. Magnesia. Magnesia, per cent. 



500 grains gave 43-70 15-607 3121 



The results of the preceding analysis are comprehended in the following 

 table : — 



Nitrogen -6585 



Hydrogen -144 



Carbon -920 



Silica 1-765 



Sand 1-575 



Carbonic acid 4-58 



Sulphur -386 



Phosphate of lime 10-556 



Alumina -1 425 



Lime 4-351 



Magnesia 3-121 



28-1990 



Lime. Magnesia. ^'^^Jjfa"'' ^^S°''<= Silica. Sulphur. 



Carbonateof lime.. 2-591 1-451 — 1-14 _ _ _ 

 Phosphate of lime.. 10-556 5-376 — — 5-18 — — 



"Tli:,:'} •••■ I-09S -900 _ _ _ _ .886 

 Silicate of lime 3824 2059 _ _ _ 1-765 - 



^^'■^^""*^ ''^j 6-554 - 3-121 3-433 



magnesia 



Sand 1-575 



Carbon -920 



Hydrogen -144 



Nitrogen -658 



Oxygen 1152 



29067 



