CENTRAL EUROPE
Increase
Countries.                  Year.    for seed sown. 
Spain                                         1828       6    for one
Portugal                                      1786      10       "
Tuscany                                                 10       "
Plains of Lucca                                         15       "
Piedmont—­Plains of Marengo                              4  to five
Bologna                                                 15       "
Roman States—­Pontine marshes                           20       "
Ordinary lands                                         8       "
Kingdom of Naples—­best districts                       20       "
Ordinary lands                                         8       "
Malta—­the best lands                                38 to 64    "
Ordinary lands                                    22, 25, 30   "

NORTHERN EUROPE.

Sweden and Norway 1838 4.50 for one Denmark 1827 6 " Russia, a good harvest 1819 5 " ——­ province of Tambof 1821 4.50 " ——­ provinces north of 50 deg. latitude 1821 3 " Poland 1826 8 " England 1830 9 " Scotland 1830 8 " Ireland 1825 10 " Holland 1828 7.50 " Belgium 1828 11 " Bavaria 1827 7 to 8 " Prussia 1817 6 " Austria 1812 7.05 " Hungary 1812 4 " Switzerland, lands of an inferior quality 1825 3 "
 Of a good quality, 8; of the best quality 12 "
France, inferior lands, 3; best lands 6 "

  (Statistique des Cereales de la France par Moreau de Jonnes.)

STATISTICS OF WHEAT CULTURE.

As wheat forms the principal nutritious food of the world, claiming the industrious application of labor over the greater part of Europe, throughout the temperate regions of Asia, along the northern kingdoms of Africa, and extending far into the northern and southern regions of the American continents; as it has been cultivated from time immemorial, and has produced in various climates and soils many varieties; it is surprising that so little is generally known of the distinct varieties best adapted to particular climates—­and that in Great Britain and the United States we have yet to learn the variety which will yield the largest and best amount of human food!