Chemisiry and Physics. AIT 
18. On Oxgall; (extract from a letter from Baron Lizsie to Prof. 
Horsrorp, oe date of Dec. 17, 1847; and also of a letter from 
M. Srrecxer, dated Nov. 5; commuticated for this Journal.) * 
— Dr. Strecker has at my suggestion resumed the i investigation - OXx- 
ae gall, and through his labors glycocoll has gained a new and important 
f* 0 It appears that the gall Way be considered a compound of 
. y free from nitrogen with sia and taurin, by which two 
phired acids are formed, and which united with soda (potash and am- 
monia), constitute the gall. One of these acids is. glyco-cholic acid 
(the old cholic acid of Gmelin); the other is tauro-cholic acid (De- 
marcay’s choleic acid.) The gall consists, one- -third of it, of alkaline 
wPncho lates. 
A good method for the preparation of this acid, is to precipitate com- 
mon impure oxgall just as it flows from the bladder, with sugar of lead ; 
wash and dry the precipitate, and then extract with alcohol. The al- 
coholic solution of this lead precipitate must be decomposed with hy- 
dro-sulphuric acid, filtered, and the precipitate of sulphid of lead 
washed with warm water, the filtrate running into the alcoholic solution 
« ntil it is rendered turbid. e whole remains then quiet, and after 
urs, the fluid stiffens to a bee mass consisting of white fine 
which are pure glycocholic acid. 
ycocholic acid is boiled with bane it decomposes into glyco- 
coll and a beautifully crystalline acid, the cholalic acid, which is iden- 
ae with Demarcay’s cholic acid. If glycocholic acid be treated with 
hydrochloric acid, it falls apart into glycocholic and choloidinic acid. 
If the boiling continues too long, the choloidinic acid goes into dyslisin. 
se changes may be snpcainesap ina “ simple manner. 
Glycocholic acid is C,.H,, NO,. 
Take Cholalic * “ ‘ ‘ . C,,H,.NO,, 
and there remains, - ‘ ; C, H, NO, 
ee f ° , Ba «Oy 
and we have glycocoll, : C, H, NO, 
Cholalic acid is Cy, Hy. 910 
et rans = ‘ : , Cys Hes Oe 
Dyslis Cy, Hy oe 
es fet differ only i in the elements of water. ectinieinealas Se 
- Nore.—We are here reminded of the relationships whic 
Sustains to hippuric acid. Benzoic ee tp is there separated t 
either with baryta or by deoetilori ic a ie 
Hippuric acid. onaedie Benzoic acid. 
———_—— Tene —— te 
op O18 Hp NO,+-Ba 0 = C, H, NO,, HO-+Ba 0, C,, H, O3. 
ry 
pot olan Glycocoll 
C,, H, NO,+-HCI-++-2HO = C, H, NO,, HCI, HO+C, H, 0,.” 
| M. Strecker in his letter observes:—“I have been at work through 
| the Summer upon oxgall, and have obtained omen? ier re- 
| Sults, th hak tee fe investigation is by no means he gall con-, 
