412 R. H. Richards—Jet Aspirator for a 
scribed in the work under review with important simplifica- 
tions, which would enable one to give for each station—with 
but moderate expense for erection, and none for maintenance 
of instruments—the exact time and intensity of each shock. 
It seems not too much to hope, with the author, “that here- 
after no earthquake will visit a civilized region without the 
attempt being made to discover, by the method here proposed, 
which would require for its application but a few hours’ time, 
its geologically important elements.” 
—The work of Professor v. Seebach is already bearing fruit in ee 
von Lasaulx’s admirable paper has already appeared, ‘at Bonn, and is 
noticed in this volume, at page 392.—Ens. 
ArT. XXXVL—A Jet Aspirator for Chemical and Physical 
Laboratories ; by Prof. Ropert H. RicHarps. 
this column, the greater = be the power of the aspirator. 
While working at Bunsen’s filter pump it occurred to me 
that the great force of asia ahi 3 is fed to the building from 
the hydrant (which was entirely lost in Bunsen’s pren- 
foked s rpc ought to be made available. Aveta 4 ; 
the subject in the winter oe 187011, to see what 
“eyes een in the way of jet pum Giffard’s injector 
was the most perfect and. accurately ea of anything that 
was found. 
oo * N. A. Review, vol. eviii, p. 518. 
