Chemistry and Physics. 151 
boils at a temperature corresponding to this pressure. M. 
blewski obtains the following results: 
Oxygen, boiling point —184° ©, 
Air, ct «“ —192°2° 
trogen, “ —193'1° 
Carbonic oxide, —193° 
On evaporating these gases in vacuo a temperature of —200° 
C. ca n be obtained. It results from the’ above that ordinary air 
li h 
to pass into the se ty already cooled when it will be Haniel 
and it can then .be allowed to flow out. This use of air involves 
no technical dificaltion and success depends only upon the mate- 
rial means at the disposal of the experimenter.— Comptes siserrer 
April 21, 1884. 2 
The Beer ie of James Prescott Joule, 
LLD., etc. 657 pp. 8vo. London: 1884. (Taylor & Wantas 
—The Physical Society of London has done a most important 
work for the advancement of physical science in collecting and 
reprinting the papers of Dr. Joule, and thus putting them in 
convenient form for the use of students and workers. The im- 
portance and lasting value of Dr. Joule’s contributions to Physics 
are so well known that this oe cian must be at once received 
team. 
volume is soon to be followed by a second containing papers 
published by Dr. Joule in conjunction with other r men o ae 
11. Whirlwinds, Cyclones and Tornadoes; by Writ1am M. — 
Davis. 90 pp. 16mo. Boston: 1880, (Lee & Bliepad: "The 
author has presented in this little volume (reprinted from Science) 
