l appliances are brought into use. These
consist of cell batteries, such as is illustrated by Fig. 4, dynamos,
operated by power, Franklin, or static electrical machines illustrated
in Fig. 5, and other electrical apparatus, the choice of the particular
machine or battery being determined by the nature of the case.

CARE AND SKILL REQUIRED.

Electricity, like other powerful agencies, in order to prove remedial
must be used of proper strength and in proper quantity. The potential,
or strength, as well as the volume, or amount, of current has to be
carefully measured for that purpose. To accomplish this, we employ an
instrument called a galvanometer, or amperemeter, illustrated in Fig. 6,
which indicates the exact amount of current being applied. For the want
of such instruments to measure the current, physicians often fail to get
beneficial results, as they are not able to administer either the proper
quantity or quality of current. Ofttimes, for like reasons, their
hap-hazard way of employing this powerful agent does positive injury to
the patient.

[Illustration: Fig. 6.
The Galvanometer, or Amperemeter.]

Of course, in treating cases at a distance, we cannot avail ourselves of
all the great variety of apparatus brought into use at our Invalids
Hotel, yet we have some forms of machines well adapted for home use, and
so simple that, by sending plain printed directions with the machines,
our patients are able to use them effectively without the aid of the
physician. Especially is this true in the milder forms of nervous
disease, and when great exactness and nicety of application is not so
important. We show in Fig. 7 and Fig. 8, two forms of such batteries
which are often furnished our patients for use at their homes. Many
times, after cases are under treatment here for a while, we are able to
educate them in the use of the battery so that by taking one of these
home with them they can continue the treatment with good results after
leaving the Institution.

ORGANIC, OR ANIMAL, EXTRACTS AS REMEDIES.

The experience of Pasteur, Brown-Sequard, and our own specialists, in
the use of extracts of nerve substance and of certain glands and organs
by hypodermic or subcutaneous injection of these fluids, has, in a vast
number of cases, been most gratifying to both physicians and patients.
Many wonderful cures have thus been obtained. Injected subcutaneously
these animal extracts are immediately assimilated and we are of