302 French National Inflituie. 
quantity of this mixt metal, and precipitating the folutiox 
. by potath added to excefs. The fecond, which the author 
' prefers, is-by diffolving the mixture in the fulphuric acid, 
and afterwards plunging in the folution a plate of zinc, 
which precipitates the copper in a metallic ftate. 
Cit. Teiffier has fhewn, that by forming artificial mea- 
dows the advantages of natural meadows may be much: 
increafed. 
» Refearches on the nature of the foil of the ifland of 
Malta, by C. Teiffier; on that of Egypt, by C. Bruguiere 
affociate; and on the ftruGture of Mount Perdu, the higheft 
of the Pyrenees, by C. Ramond affociate, have occupied, 
in:fucceffion, the clafs of the Phyfical Sciences. It received 
alfo fome interefling details in regard to the medical art on 
an extra-uterine pregnancy, obferved by C. Saucerote 
affociate ; on urinary and arthritic concretions, by the fame; 
and the cafe of a man, all whofe bones, except the teeth, 
acquired in the fpace of a few years an exceflive fize, with- 
out the mufcles being affected im this fingular malady. 
For a long time naturalifis have been fenfible of the ne- 
ceffity of having a new method of clafling birds ; and they 
withed that this method, by being fuited, on account of ifs 
precifion, to the great quantity of known fpecies, fhould 
render the characters of them eafy to be diftinguifhed; and 
be at the fame time applicable to other fpecies not yet 
difcovered,..This has been executed by Cit. Lacepede. 
His new table, in which he has included 124 genera, is 
preceded by new principles, according to which, in_his 
opinion, naturalifis ought to compofe methodical tables.of 
the different clailes of animals. 
MATHEMATICAL AND PHYSICAL SCIENCES. 
Analyfts divide the problems which they with to :refolve 
into’ two claffes, one of which includes thofe which can 
he reduced to an equation, in which there is one unknown 
quantity combined, throughout all the arithmetical opera- 
; tions, 
