VEGETABLE PKODUCTIOXS OF NORWAY. 



not the case. Corn and other plants will ripen under a 

 much lower temperature, and in a much shorter time,* 

 in Norway than in any of the more southern countries ; 

 and even in the same country there is a marked 

 difference in this respect between the southern and 

 northern districts. Corn or other seeds brought from a 

 southern to a northern cl\mate require at first a longer 

 time to ripen in than the same species which have been 

 cultivated there for some time ; and conversely, seeds 

 brought from a higher to a much lower latitude will in 

 the first and second years ripen earlier than those of the 

 same species which belong to that lower latitude. 



Again, it may be remarked that so long as a plant is 

 not cultivated further north than is compatible with its 

 attaining its full development, the seed increases both 

 in size and weight for the first three years ; but it 

 diminishes in like manner if cultivated several degrees 

 furthe rsouth. The greater the difference in the lati- 

 tude the more marked is the disparity. 



Again, the flowers of plants assume an intenser 

 colour, and the foliage of trees a brighter green, the 

 further they are found to the north. 



Those plants whose roots, leaves, flowers, &c., 



* To give only one instance : six-rowed barley takes ninety clays 

 to ripen in from the date of sowing on the banks of the Nile. From 

 an experiment made by Dr. Sehiibeler, with seed of the same variety 

 obtained from Alten, only fifty-five days elapsed between the date 

 of sowing and of ripening. 



