218 Scientifie Intelligence. 
by heat alone and forms an ether. It plays we part of an incom- 
plete peo ol.— C. R., Ixxx, 1396, June, 1875. 4G. F. B. 
7. rarabin, a@ new ‘Carbohydr rate. ea ee has pre- 
ared both ‘from the tissue of beets and of carrots, a new w carbo- 
ing with schol and drying, forms a friable white pe swell- 
ing up in water and dissolving on the addition of an acid when 
heated. Alkalies peepee it seen,» and it gives no oil 
souiast with it, it is converted into arabinic acid. Quantitative 
experiments showed that 38°5 per cent of the beet pulp 
arabinic — 54:0 per me pararabin, and 7°5 per cent cellulose 
er. 1. Chem. Ges., iy Sea 1875. 
Pricti tion of Rurefied yee ’*a. Kunpr and E, Wars 
have investigated some soe. ‘of the kinetic theory of gases 
when the pressure is exceedingly small. This theory plage 
that 1 the mean length of path of the molecules is a quantity t that 
may be neglected in comparison with the linear dimensions of the 
space filled with the gas. But as this path is saatar as the 
density, this is equivalent to saying, that the density in a given 
space must not be too little. It appears that the sliding coefficient 
for a gas and a solid partition has sensibly a determined value 
gas molecules ren reflected from the partition with its ae of 
Seewation to 1:4 (42),—consequently for air, for which t 760 
mms. pressure /=-000083 mms., according to Stefan, to to 000058 pe 
p being the pressure in mms. of mercury. The present — 
ment gives the coefficient about twice as great, or ‘0001. From 
The presen du he 
ing to Maxieott’s method. as logarithmic decrement of t 4 
torsional vibrations — a glass disk between two fixe 
disks near it was m Th 
was 159 mms., its weight ¢ oe grms., and ae =. held he a bifilar 
suspension of two fine silver wires 063 m amete . 
made the disturbing damping movements so eet that they migh 
