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results of experiments on artificial mutations and several other studies
of basic evolutionary processes, theoretical and practical.

Although the need for retrieval of chromosome data has become
particularly acute in recent years, it has long been recognized. The
first attempt to index published chromosome numbers was made by the
German cytologist Tischler in 1915, when he published a 120-page list
of chromosome numbers and their bibliography. He continued this indexing
and published, from 1927 to 1938, a series of five chromosome number
reviews in Tabulae Biologicae, a publication which now is extremely rare
and difficult to find even in university libraries. Later, in 1950,
Tischler also published a list of chromosome numbers of the higher plants
from Central Europe. Four chromosome lists were published, from 1926
to 1934, by the Canadian botanist Gaiser, and the French cytologist Delay
compiled, in 1950, a list to cover the period from Tischler's list (1938)
up to 1949. Other chromosome indexes covering selected parts of the
world's flora have been published, e.g., for the cultivated plants of
Japan by Kihara, Yamamoto, and Hosono (1931), for cultivated plants in
general by Darlington and Janaki-Ammal (1945), and for flowering plants
in general by Darlington and Wylie (1955) and by Fedorov and associates
(1969). Since 1958, an annual index of chromosome numbers has been published
under the editorship, first, of Cave, later by Ornduff, and presently by
Moore, by the University of North Carolina Press and now by Regnum Vegeta-
bile. That list is compiled by a number of cytologists, mostly American.

Lists of more restricted floras or groups of plants have been
published by various scientists since Tischler (1934) indexed the chromo-
some numbers then known for the flora of Schleswig-Holstein. For the
Pteridophytes, Chiarugi (1960) and later Fabbri (1963, 1965) have published
critical lists in Caryologia. Maude (1939) and Rutland (1941) made
critical taxonomical chromosome lists of the flora of the British Isles;
Löve and Löve (1942) have published a critical list for the flora of the
Scandinavian countries, followed by another critical list for all the
Northern countries of Europe in 1948 and for the flora of Central and
Northwestern Europe in 1961; they also made a critical review of the
chromosome numbers of the Icelandic flora in 1956 and of the flora of
Mount Washington, N.H., in 1966. Other substantial lists covering entire
floras are those by Tarnavscchi (1948) for Romania, by Jørgensen, Sørensen,
and Westergaard (1958) for Greenland, and by Taylor and Mulligan (1968)