in Germany, and in Itaby by my friends Ridolfi and Felici. 
“-¥ersation on the various methods employed | by the Electric Telegraph 
continent prior to these investigations of M. Ma 
of the earth to conduct _electricity.—Mr. 
“ 
derstood that the water contained. in the superficial stratum is the con- 
ucting medium; since he has proved that non-metalliferous i and 
dry earth will not conduct an electric current. 
the employment of the ae oe Lead we Eorhares Acid as pu- 
rifying agents ; by Dr. Scor 
On‘ the southern coast of stn, in a region limited by Almeria on 
the east ilaga on the west, bounded on the north by mountain 
-Tanges’ ‘and onthe: ante by the Mediter erranean, is a tract of land which, 
so fareas its cliniate. and productions are conc erwed: may be aptly des 
re- 
»@ circumstance which een) Spain itself seems to be very 
little voowe. There is perhaps no example on record of any operati 
tion of materials as the operation of extracting sugar from the cane. 
One portion of this loss is due to mechanical, another to chemical 
causes. The sugar-cane has been ‘ete’ by most writers who have 
found opportunities = practically examining the subject to contain no 
more than 10 per cent. of solid non-saccharine matter, leaving 90 per 
cent. of juice to be pice OF this 90 per cent., most writers con- 
cur in testifying that in practice scarcely 50 per cent. are actually ob- 
tained ; at least in the British West India possessions. Cane juice itself 
has usually been stated to contain pe to 23 per cent. of crystalline 
ugar, of which scarcely 7 per cent. in practice is actually extracted. 
ny of other experimente ers. Having operated on canes from v: ie 
parts of this district, by slicing them, exhausting first by hot ay 
and then by hot ne and finally drying, I obtained as my mea 
sult about. 10 per cent. of woody or insoluble matter; whilst the suger 
Qu eore etal inet ranged from 17 to 23 per — as had previ- 
zCOND Sertss, Vol. X, No. 30.—Nov., 1850. 
; Sor the Adelincctents sey ‘Societal. | 409° 
in metallic wires according to their. Section “atid length. and the thee. 
more general cases of the propagation of the electrical current, and i 
4 of derivation, in large metallic plates, or in spherical masses andin 
oe earth, such as they have been found by MM. Kirchhoff and Smaaeen 
" - The reading of the Se from Prof. Matteucci led to a con- 
On the Sugar Produce of the South of Spain, chiefly i in connection with mee 
