Abstract
The purpose of this study was to research which of some classifications and indexes of the climate is preferable for a delimitation of the forestal vegetation zones in Italy. The Author, after a short account (chap. 1st) of the best known systems of classification and synthesis about the climate, delineates briefly (chap. 2nd) the characteristic aspects of the Italian forestal vegetation and of its distribution, elaborating then (pages 27, 28) a table of the climatical dominant types in Italy according to Köppen and de Martonn's schemes. In the third chapter the A. proceeds, making a comparative examination of Pavari (1916) and Rubner's (1934) classifications and of Lang's (1915–20), de Martonne's (1926), Amann's (1929), Emberger's (1930–33), Gams's (1931–32), Kotilainen's (1933) indexes; the elements for the calculation of other indexes named in the first chapter were not available. Such an examination, made on the basis of the climatical data (Tab. I) of 474 Italian stations, whose vegetation has been controlled (Tab. II), brought to the following conclusions.

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