52 THE WOMBAT. 



The formula for emulsion is one recommended by Professor 

 Spencer B. Newbury, of Ithaca, N.Y. : — Nelson's No. i gel- 

 atine, 123 grains; distilled water, 10 ounces; allow this to 

 soak for half-an-hour, and then dissolve by placing the vessel 

 containing it in hot water, only heating sufficiently to just 

 render the gelatine fluid- — -When such is the case add 1 

 drachm of a solution of hydrochloric acid (made by adding one 

 part of acid to 100 of distilled water), and pour the acidified 

 solution into a large stone or opaque bottle. In the dark 

 room add 500 grains of nitrate of silver, preferably in large 

 crystals, and agitate till dissolved, then add 386 grains of 

 potassium bromide (also in crystals) a little at a time, and 

 shaking well between each addition till the whole is dissolved. 

 154 grains Heinrich's hard emulsion gelatine are then well 

 soaked in distilled water, drained from excess and melted at 

 a low temperature. Into this pour the emulsion from the 

 bottle (in the dark room of course, as the mixture is now 

 sensitive to white light) and thoroughly mix. The emulsion 

 must now be allowed to set to a jelly, the simplest way being 

 to pour it into a large clean basin, tie a covering over the top 

 to keep out the light and allow it to stand all night — when set 

 it is forced through a piece of coarse embroidery cloth, or 

 canvas, by placing the lump of emulsion in the centre of the 

 canvas, gathering up the four corners in one hand and 

 twisting the lump with the other hand till it is forced through 

 in shreds. These shreds are then washed for a couple of 

 hours in frequent changes of water, an easy plan being to 

 use a small hair sieve to hold the shreds, and to stir occasion- 

 ally while the tap water is running through. 154 grains more 

 of the hard gelatine are now soaked and melted, and the 

 emulsion which has been allowed to thoroughly drain is added, 



J. S. BAYLEY, 



FISHMONGER AND POULTERER, 



RYE/IB STREET. 



FAMILIES WAITED ON. -*- OYSTERS A SPECIALTY. 



