ature. These experiments have been made before great
numbers of enlightened persons and have been largely repeated by my
students. Manifestly I cannot speak with any less confidence of
Anthropology than a chemist does of chemistry, when for forty-five
years, I have ever been able and willing to demonstrate its principles
by experiments on intelligent persons, changing their physical
strength, their circulation and their mental faculties.

2. SENSITIVE.--I have felt nearly all the functions of the brain in
various degrees of excitement in my own person, and know the positions
of the organs as well as the gymnast knows the position of the muscles
in which he produces fatigue. My physical sensibility has been so
acute as to recognize by local sensations at all times the degree of
activity in any portion of the brain, manifested by local warmth and
sensibility, by a sanguineous pressure, by vivid sensations in the
scalp, with erection of the hair, or by aching fatigue, or by
irritations and tenderness in the scalp; or in case of inactivity by
the entire absence of sensation, or in case of obstruction by a
distinct feeling of oppression.

3. PSYCHOMETRIC.--I have explored every portion of the brain with care
and minuteness by the psychometric method, even tracing the
convolutions and their anfractuosities, and observing from point to
point how beautifully and harmoniously the innumerable functions blend
with each other; how the different portions of a convolution vary, and
how the different conditions of the brain and different degrees of
excitement modify the results; and these investigations have been
carried on for years, until results were clearly established and over
and over confirmed by psychometry, by experiment, and by
consciousness.

4. MATHEMATICAL.--The development of so positive a science enabled me
to establish certain mathematical or GEOMETRIC laws of cerebral
action, concerning the direction and mode in which all faculties act
upon the mind and body, which laws constitute the BASIC PHILOSOPHY of
Anthropology, the highest generalization of science. These laws
constitute a compact system of science, lying at the basis of all
psychology, as the bony skeleton is the basis of the human form. These
laws being easily demonstrated, and giving great clearness and
systematic beauty to the whole science, are alone a sufficient
demonstration. They constitute the science of PATHOGNOMY.

5. CRANIOSCOPY.--In describing