As a division were classed the aborigines of India and of Egypt, with an average 80 cubic inches of brain, a very large cerebellum, and a cerebrum comparatively small. Their intellect was as characteristically statical as that of the other yellow races, the dynamic impulse manifesting itself only in symbolism, mysticism, and the like. At the head of all stood the white races, Aryans for the most part, but with the Semites--Chaldeans, Phoeniceans, Hebrews, Carthaginians, Arabs--as a subdivision. Ideally, their facial angle was 90°--the right angle--and their cubic inches of brain ranged from 92 to 120, rising in individual instances--the lecturer named Byron--as high as 150. The number in the chart for the Aryans--Sanskrit-speaking Indians, the Greeks and Romans, the Goths, Kelts, Slavs, and their progeny--was 92, and for the Semitic peoples 88. The Aryans were credited with a due balance between the dynamical and statical energy of their intellect, to which they owed nearly all the great inventions and discoveries, and with all the systematic development of science. They brought forth the philosophers, moralists, engineers, sculptors, musicians. The Semitic intellect was predominantly statical, being but little developed in the creative or dynamical direction, and then mostly in theological thought. They produced, however, musicians, traders, and conquerors. * * * * * ECCENTRICITY AND IDIOSYNCRASY. [Footnote: An extract from a Treatise on Insanity shortly to be published by D. Appleton & Co.] By WILLIAM A. HAMMOND, M.D., Surgeon-General U.S. Army (Retired List), Professor of Diseases of the Mind and Nervous System in the New York Post-Graduate Medical School, etc. ECCENTRICITY.--Persons whose minds deviate in some one or more notable respects from the ordinary standard, but yet whose mental processes are not directly at variance with that standard, are said to be eccentric. Eccentricity is generally inherent in the individual, or is gradually developed in him from the operation of unrecognized causes as he advances in years. If an original condition, it may be shown from a very early period of life, his plays, even, being different from those of other children of his age. Doubtless it then depends upon some peculiarity of brain structure, which, within the limits of the normal range, produces individuality of mental action.