admit that even this classification is
imperfect, as from the nature of the case it must be; for the source of
the confusion lies in the very unity of mankind. He rejects _in toto_
Professor Agassiz's "realm-theory," as inconsistent with facts. The
hybrid-question, as put by Messrs. Gliddon and Nott, meets with a
searching and careful investigation, with the conclusion that nothing
in facts yet ascertained proves any want of vitality or power of
propagation in mulattoes or in crosses of any human races.

The unity of origin and the vast antiquity of mankind are the two
important conclusions drawn.

His second volume is entirely devoted to the negro races, and is the
most valuable treatise yet written on that topic.

The whole work is mainly directed towards _Naturvoelker_, or "Peoples in
a State of Nature," and therefore cannot be recommended for translation,
as a general text-book on the science of Ethnology,--a book which is
now exceedingly needed in all our higher schools and colleges; but as
a general treatise, with many new and important facts, scientifically
treated, it can be most highly commended to the general scholar.

_Il Politecnico. Repertorio Mensile di Studi applicati alia Prosperita e
Coltura Sociale._ Milano, 1860. New York: Charles B. Norton, Agent for
Libraries, 596, Broadway.

Among the best first-fruits of Italian liberty are the free publication
and circulation of books; and it is a striking indication of the new
order of things in Lombardy, that the publishers at Milan of the monthly
journal, "Il Politecnico," should at once have established an American
agency in New York, and that in successive numbers of their periodical
during the present year they should have furnished lists of some of the
principal American publications which they are prepared to obtain for
Italian readers. It will be a fortunate circumstance for the people of
both countries, should a ready means be established for the interchange
of their contemporaneous works in literature and science.

The "Politecnico" is not altogether a new journal. Seven volumes of it
bad been published, and had acquired for it a high reputation and a
considerable circulation, when political events put a stop to its
issue. The Austrian system of government after 1849 repressed alt free
expression of thought in Lombardy; and no encouragement was afforded for
the publication of any work not under the control of the administration.
With the begin