378 Plate Electrical Machines. 
Upon examining the tube with a lens, nothing was seen 
which could prevent the entrance of the alcohol; on with- 
drawing the tube from the alcohol, the external air entered 
with a hissing. 
M. Dobereiner conceives that the diameter of the tube 
was so small that the alcohol could not enter, but only the 
air which it contained. 
5. Leghorn Straw Plait,—The Dublin Society, having 
Fr premiums for the best imitations o orn 
Plait, awarded three prizes to successful candidates. 
less than twenty-four specimens were exhibited fromwide - 
ly remote parts of Ireland. The finest specimen was made 
from Avena flavescens, or yellow grass, by Miss Couiins of 
Plattin, near Drogheda. The second was made of Cynos- 
urus cristatus, or crested dog’s-tail grass, by Miss Grim- 
LEY; of ee: Newton, Mount sash re The third 
ba Miss Came- 
Deity of Lond 
16. ig 1 ae of pst ae Neves of a oe - sub- 
stance.—M. Mitscherlich, whofirst observed the Memarksble 
fact that a body may affect two different crystalline forms, 
has, ina memoir on this subject, quoted sulphur as an in- 
stance. Natural crystals of sulphur are furnished by some 
calcareous strata, and by volcanoes. Artificial erystals 
may be obtained pitas by evaporating a solution of it in 
carburet of sulphur, or by fusion of the sulphur and slow 
cooling. On fusing native sulphur it gives the same crys- 
tals as common su phur. The primitive form of the crys- 
tals of sulphur, either natural, or obtained as above by 
evaporation, is an octaedron, with a rhombic base; ! 
the primitive form of the crystals apt ef fasion is 
an ‘oblique prism, with a Pompe bas 
2, Plate electrical machines.—A. va a 
struc ruction of the plate electrical mach 
n in 1 the con- 
devised 
cite the glass, and then. rt 
Mz Metzger concladed that the di 
Bets = as 
