reform of the calendar was put forward in his _Elenchus
Calendarii Gregoriani_ (Frankfort, 1612); and he published a book on
music, _Melodiae condendae ratio_ (Erfurt, 1592), still worth reading.

For details see V. Schmuck's _Leichenrede_ (1615); J. Bertuch's
_Chronicon Portense_ (1739); F.W.E. Rost's _Oratio ad renovendam S.
Calvisii memoriam_ (1805); J G. Stallbaum's _Nachrichten uber die
Cantoren an der Thomasschule_ (1842); _Allgemeine Deutsche
Biographie_; Poggendorff's _Biog.-Litterarisches Handworterbuch._

CALVO, CARLOS (1824-1906), Argentine publicist and historian, was born
at Buenos Aires on the 26th of February 1824, and devoted himself to the
study of the law. In 1860 he was sent by the Paraguayan government on a
special mission to London and Paris. Remaining in France, he published
in 1863 his _Derecho international teorico y practice de Europay
America_, in two volumes, and at the same time brought out a French
version. The book immediately took rank as one of the highest modern
authorities on the subject, and by 1887 the first French edition had
become enlarged to six volumes. Senor Calvo's next publications were of
a semi-historical character. Between 1862 and 1869 he published in
Spanish and French his great collection in fifteen volumes of the
treaties and other diplomatic acts of the South American republics, and
between 1864 and 1875 his _Annales historiques de la revolution de
l'Amerique latine_, in five volumes. In 1884 he was one of the founders
at the Ghent congress of the _Institut de Droit International._ In the
following year he was Argentine minister at Berlin, and published his
_Dictionnaire du droit international public et prive_ in that city.
Calvo died in May 1906 at Paris.

CALW or KALW, a town of Germany, in the kingdom of Wurttemberg, on the
Nagold, 34 m. S.W. of Stuttgart by rail. Pop. (1905), 4943. It contains
a Protestant and a Roman Catholic Church, two schools, missionary
institution, and a fine public library. The industries include spinning
and weaving operations in wool and cotton. Carpets, cigars and leather
are also manufactured. The timber trade, chiefly with the Netherlands,
is important. The place is in favour as a health resort.

The name of Calw appears first in 1037. In the middle ages the town was
under the dominion of a powerful family of counts, whose possessions
finally passed to Wurttemberg in 1345. In 1634 the town was taken by the
Bava