A Manual of Practical Hygiène, prepared especially for use in the Medical Service of the Army. by Dr. E. A. Parkes, M.D. Lond., F.R.S., Professor of Military Hygiene in the Anny Medical School, &c., &c.

When, in one of the master-pieces of our great dramatist, Iago, the world-worn ancient, vents his spleen on the fact of Cassio's promotion, he desci-ibes that fortunate officer as an "arithmetician," feathering his shaft of sarcasm from the wing of such prejudice as is begotten of envy and professional discontent. It will be remembered that in the sequel of the play poetical justice is fully satisfied, since the princes of the Venetian state entrust to Cassio the supreme command. The exact-