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and plants in the North, he adds :—* Le principal probléme à résoudre 
dans l'amélioration ou l'introduction des races agricoles, est en Norvége 
la précocité. . . . Cette précocité se développe successivement avec les 
années, comme si les plantes n’obéissaient pas tout à coup à l'influence 
du nouveau climat sous lequel on les a transportées, mais exigeaient 
plusieurs générations successives pour s'y habituer. Mais ce qui est 
plus remarquable, et d'un grand intérét pour la théorie de l'acelima- 
tisation des végétaux, c'est que cette précocité tend à se fixer et à se 
constituer à l'état de race.’ And he concludes: ** Les conséquences à 
tirer de ces données, c'est qu'il faut développer et aller chercher dans 
le Nord, des varictés prócoces de la plupart des végétaux utiles que 
nous cultivons." 
Adopting the system of Endlicher, Dr. Schübeler proceeds to treat of 
the Amphibrya (Monocotyledones) and Acramphibrya (Dicotyledones). 
In the former of these the author mentions many interesting experiments 
which he has made with the cereals, and which to his own countrymen 
must be of peculiar value. "The results arrived at from his experiments 
with Zea Mays will be found treated of in detail at pp. 35-44 ; and Dr. 
. Schübeler comes to the conclusion that though it would by no means be 
profitable to cultivate Maize for the sake of its grain, yet as green food 
it might in some places answer. Barley, which from the last census 
composed 24-1 per cent of the whole corn-produce of the country, can 
be grown as far north as lat. 70?; and, as an instance of the peculiar 
effect the long days have on the vegetation in these parts, it is 
worthy of notice that it will grow 23 inches in the twenty-four hours for 
several consecutive days at Alten, lat. 69° 5T. Oats (Avena sativa, L., 
* Havre," Norsk) are the most generally cultivated grain in Norway, 
and form 55:8 of the whole corn-produce. Their northern limit is 
lat. 69? 3', It may not, perhaps, be generally known that in years of 
scarcity, it is a common thing for the peasants to mix oatmeal with 
the bark of certain trees. Wheat is but little cultivated, and by the 
last census comprised only 14 of the whole corn-produce, When it is 
borne in mind that of the 121,800 square miles which Norway contains 
only 1060 square miles are tillable, it will be seen that the corn im- 
ports must figure rather largely in the commercial returns of that country. 
