98 Scientific Intelligence. 
spect to diathermanous bodies), according as it has traversed the crys 
tal in one or another direction. ‘These differences are connected with 
the polarization of heat, and in this respect it is found that 
(2.) The transmission of rays of heat perpendicular to the crystallo- 
graphic axis of rock crystal, beryl or tourmalin, is in a very different 
proportion from their transmission parallel to the axis, when the plane 
of polarization makes an angle of 90° with the axis of the crystal. 
properties, whatever be the position of the plane of polarization, which, 
with an infinite diversity of position, always passes through the axis of 
_{5.) The rays which have traversed the three last named crystals in 
different directions perpendicular to the axis, exhibit no difference with 
1 
of bismuth gave 55266 with a probable error of 0:0402. - It would 
appear probable that the magnetism of the iron exerted some influences 
but none could be attributed reasonably to the diamagnetism of the 
bismuth.— Pog, Ann., Ixxxv, 
g : 
3. Preparation of pure Methylic Alcohol.—Wéuter has given @ 
weight of sulphuric acid, avoiding an elevation of temperature. The 
mixture is to be allowed to stand a day, then distilled from two parts by — 
weight of binoxalate of potash. A volatile fluid at first passes ovels 
after which the oxalate of methyl-condenses in the neck of the Bese 
~ recetver Is now to be changed and the distillation contin 
long as the ether 
Re EES weet 
¥ BL i Pees es we 
~ eee ae, 2 
mes over. The neck of the retort is then tobe 
the oxalate allowed to flow into the receiver whe? 
it 
