Electro-physiology and electro-therapeutics : showing the best methods for the medical uses of electricity / By Alfred C. Garratt.

merits, and for its very peculiar adaptation under frequently recurring circumstances, for the treatment of a given class of cases, must (as it becomes better known, judging from experi- ence) always gain for it a prominent place among the more practical and reliable of our best electro-therapeutics. For these reasons, too, the author has interested himself, through no small pains and expense, to procure its present improved arrangement and structure for greater and more uniform efficiency ; and with him also originates the first methodical and substantial manu- facture of this useful little article for physicians' and surgeons' use, so that it can now be provided at slight expense, and yet is as reliable as it is portable and durable. It is in fact a part of Garratt's Medical Battery, which is a new combination, a portable arrangement, of old gal- vanic and voltaic principles, yielding only a primary current, and is admirably adapted to very many medical purposes. It is, in effect, two batteries in one ; that is, one is simply a " quan- tity " current, or, in other words, is without intensity; while the other is a graduated u intensity" current. It can be used separately, for certain cases, or double and compound for others; while the thing is peculiarly portable, clean, easy to use, and durable : a wine glass of vinegar is sufficient to put the whole in full action, as its power depends upon the nice " contiguity of metals" and not on the amount of chemical action. Out of a Garratt's battery, thus can be arranged, at any moment, a Humboldt battery, and each as complete when separate as when together; and in the same box suitable electrodes, &c, are provided, with directions how to apply the different primary currents. The whole might be easily deposited in the drawer of any portable electro-magnetic boxed battery; and this would make a physician's electric armamentarium complete, with all varieties of primary and secondary currents for medical pur- poses, as nowhere else to be found. Garratt's battery, therefore, can be carried to the bedside, and speedily adjusted, for producing the most gentle and