338 Printing upen Zinc. 
pletely decomposed in the course of the fermentation. [tis 
probable that this would not have been the case without the 
sugar and theeggs. ‘To obtaina leaven which will answer 
for future batches, reserve a portion of the dough, pour on it 
the second half of the decoction of hops, previously heated, 
and add the same quantity of sugar, white of eggs, and flour 
as before ; knead the whole with a bit of the former leaven 
and let it rise inthe trough. Nothing but flour need afterwards 
be added.— Bull. de Sciences, Sept. 1825. 
21. Method of making Soup of bones, as practiced in the 
Hospital of Montpellier—The various means of extracting 
gelatine, hitherto published, require no inconsiderable atten 
tion andexpense. The managers of the hospital of Montpel- 
lier, have succeeded in a more economical method ; namely— 
The bones are broken with a hatchet into pieces from an 
inch toan inch and a half long, with which an earthen pot is 
made two-thirds full. Water is then added, an earthen cover 
is adjusted, and the potis placed in an oven immediately after 
the batch is withdrawn. After remaining four hours, the pot 
is found to contain very fat and gelatinous soup. This being 
porte off, the pot is again filled with water, placed againina . 
ot oven, and affords, after an exposure of six hours, broth less 
rich than before, but still of good quality. It is filled a third 
time with water, and being heated seven or eight hours yields 
a fresh supply. These three portions are then mixed togeth- 
er, and being properly seasoned with vegetables, the whole 
affords a very nutricious and valuable arte of diet. Six kil- 
logrammes of bones extracted from coarse meat, produce 
twenty-one killogrammes of broth, which isa sufficient quanti- 
ty for dealing out to four hundred and forty of the hospital 
oor. 
Fe There is no process which requires less skill and is more 
economical, for itsaves even the expense of fuel. Bulletin 
Univ. Nov. 1824. 
22. Printing upon Zine.—At the bookstore of Leake, at 
Darmstadt, has appeared the first great work whose prints 
are taken from plates of zinc. It is a collection of architec- 
tural monuments which will consist of twenty numbers. The 
drawings are made upon zinc as upon stone, and the ex- 
pense of engraving is thus avoided. The editor is in conse- 
quence able to sell each number containing twelve folie 
