Hatching of Fishh 381 
by mixing it in fine powder with strong muriatic acid, and 
surring it until the whole becomes a smooth homogeneous 
mass, of a semi-gelatinous consistence. We not here 
merely. to remark on the circumstance that Bie: 
which Prussian Blue is insoluble, should be found use 
enabling it to combine with silk, cotton, wool. &e. The 
pure ferro-prussiate of i iron is soluble i in water, but the in 
tion of a small portion of m 1 
itates it; wash away the acid by pure water, and. the pig. 
ment broom? ae ble acmane - pecnids and it ee adie 
tates, 
22, Test taper ‘Monphians sche ‘Dub blane, a druggist of 
Paris, states that he finds the tincture of nut-galls a very 
sensitive test of the presence of morphium in fluids, wheth- 
er it exist free or in combination with acetic or sulphuric 
acid. 
23. Cafeine—Cafeine is a crystallizable principle dis- 
i uxered:i in 1821, in coffee, by M. Robiquet, whilst search- 
ing in it for quina. 
= “aM, M. ie ter and C btained tk > at 
the same time, but did not complete — mien a M. 
Robiquet read a memoir on this subject to the Société de 
Pharmacie of om s, which has not ines published. It is, 
however, known to be a new principle, white, erystalline, 
volatile, and slightly soluble. 
24, Hatching of Fish.—T he Chinese Sane a method of 
hatching the spawn of fish, and thus protecting it from those 
accidents which ordinarily destroy so large a portion of it. 
The fishermen collect with care, on the margin and surface 
of gary all those gelatinous masses which contain the 
Spawn of fish; after they have found a sufficient quantity 
they fill with it the shell of a fresh hen’s egg, which t 
have previously emptied, stop up the hole, and putit dodler 
| At the expiration of a certain number of 
ell in water warmed by the sun: 
ently hatched, — are kept in pure 
eg Perky thrown into 
h. The sale ots spawn for this pure 
Pose, forms ; an important branch of trade in China. rz 
