PROXIMATE PRINCIPLES OF SOME OF THE LICHENS. 
81 
Calculated uumbers. 
I. 
II. 
34 C 2598*7900 
55*57 
55*82 
55*28 
15 H 187*1925 
4*00 
4*39 
4*30 
13 0 1300*0000 
27*82 
27*49 
28*12 
KO 589*9200 
12*61 
12*30 
12*30 
4675*9025 
100*00 
100*00 
100*00 
These numbers give C 34 O^g+KO as the formula of evernate of potash. This 
salt loses no water at 212 ° F., and appears to be anhydrous. 
The Bai'yta Salt. 
The baryta salt was prepared in a way similar to the potash salt, by dissolving the 
acid in an excess of cold baryta water, and neutralizing the solution by a stream of 
carbonic acid gas. This salt is but little soluble in water, but very soluble in weak 
spirits. It crystallizes in small prisms. It was first dried in vacuo, and then at 
212° F., when it lost no water. 
I. 0'207 grin, salt gave 0‘049 carb. of baryta =0’038 BaO =18*35 per cent. BaO. 
II. 0*1683 grm. salt gave 0*0470 sulphate of BaO =0*0308 BaO =18*30 per cent. 
BaO. 
I. 0*2435 grm. salt gave 0 449 carbonic acid and 0 09 water. 
II. 0*2534 grm. salt gave with chromate of lead 0*4675 C 02 and 0 0*94 water. 
Calculated numbers. 
I. 
II. 
34 C 2598*790 
50*40 
50*30 
50*31 
16 H 199*672 
3*87 
4*10 
3*96 
14 0 1400*000 
27*17 
27*08 
27*38 
BaO 956*880 
18*56 
18*52 
18*35 
5155*342 
100*00 
100*00 
100*00 
The rational formula of evernate of baryta appears therefore to be C 34 H 45 Oj, 
+ BaO+Aq. It contains one atom of water. 
Evernesic Acid. 
A quantity of evernie acid was dissolved in a slight excess of caustic potash, and 
the solution boiled for a few minutes. A stream of carbonic acid gas was then sent 
through the dark-coloured liquid till all the eaustic alkali was neutralized. The 
solution was then concentrated, and on its being set aside for some time, a quantity 
of scaly crystals was deposited. These crystals are the potash salt of a new acid 
which I shall call evernesic acid. They are very soluble in water and in hot spirits, 
but they may be washed with cold spirits without much loss. They are rendered quite 
colourless by digestion with animal charcoal. If the aqueous solution of the potash 
salt is decomposed by muriatic acid, a white flocculent precipitate is obtained. This 
precipitate readily dissolves in boiling water, and is deposited on the cooling of the 
liquid in long hair-like crystals of a silky lustre. These crystals are evernesic acid. 
MDCCCXLVIII. M 
