MISCELLANY. 
77 
In 100 parts. 
Atoms. Calculated. Found. 
8 Carbon 606.83 . . 48.60 . . 48.41 
5 Hydrogen .... 62.40 . . 5.00 . . 5.26 
1 Nitrogen 177.04 . . 14.18 
2 Sulphur 402.33 . . ^32.82 
1 Atom of oil of mustard = 1248.60 . . 100.00 
The combination with ammonia yielded on analysis the following 
results : 
First: 0.5923 grains of oil of horse-radish, 0.883 grains carbon, and 
0.377 grains water. 
Secondly : 0.663 grains of oil of horse-radish, 0.989 grains carbon, and 
0.413 grains water. 
The combination with ammonia, therefore, corresponds in composition 
with that of the oil of mustard, and the two oils may be considered as 
identical. It is singular that man should have selected horse-radish and 
mustard as condiments, on account of their analogy in taste, as he also 
thus detected the analogy between tea and coffee. — Ibid from Ibid. 
On the frequent occurrence of Lead in Cochineal. — M. Dietrich, in a let- 
ter to Prof. Wohler, mentions his having received a parcel of cochineal, 
which in appearance left nothing to be desired as to quality, but which 
had nevertheless been subjected to a gross sophistication. The white 
coating, for instance, was artificial and contained so many granules of 
lead that they amounted to nearly 12 per cent in weight. When the 
mixture was reduced to a very fine powder, and then carefully sus- 
pended, a blight metal remained behind. Since cochineal is frequently 
„ employed by pastry-cooks the sophistication is highly dangerous : and 
thjs adulteration appears now to be very generally adopted, for all the 
samples of cochineal which the author examined proved to contain lead. 
Chem, Gaz. from Archiv. der Pharm. 
Extemporaneous Vesicant. By Dr. Darcq. — Into a flat watch glass, 
pour from 8 to 10 drops of very concentrated ammonia; cover the liquid 
with a large piece of linen on a rather less diameter than that of the 
glass, and slowly apply this little apparatus to the previously sheaved 
skin. Keep the whole in its place by means of moderate pressure with 
the fingers. 
As soon as a red ring, about 2 centimetres in breadth, is observed round 
the glass, it is certain that vesication is effected. Sometimes scarcely 
