This dis¬tinguished French writer
although a very much lower amount is suitable afterwards; a remark that is chiefly applicable to the natives of what are called extreme climates, that is to say, where a very liigh summer temperature is followed by a very low winter tempera¬ture. Such countries are Persia, and many parts of the United States, where the summers are excessively hot, and the winter's cold intense. The seeming impossibility of imitating such conditions artificially will probably account for many of the difficulties we experience in bringing certain fruits, the Newtown Pippin, the Cherry, the Grape, the Peach, and the Almond, to the perfection they acquire in other countries. 153 The great point to attend to in these considerations is the extremes of temperature to which plants are subject when growing; for this reason the calculations of M. Boussingault have less value than might have been anticipated. This dis¬tinguished French writer upon rural economy proposed, some years ago, a method of determining what amount of HEAT a plant requires, in order to be enabled to perform the functions allotted to it by Nature. This method consisted in determining the length of time over which a function extends, and also the mean temperature during that period. Thus, if a given plant requires 20 days to ripen its seeds after flowering, and the mean temperature during that time was 10°, it would be assumed that the plant in question requires 200° of heat to complete the ripening process. Or if the period occupied was 10 days, and the MBT Shoes mean heat 10°, then only 100° of heat would be required, and so on. M. Boussingault's method was a great improvement upon the previous modes of computation. Observers had been previously contented with annual or quarterly, or other long INUTILITY OF MEAN AIR TEMPERATURES. means of temperature, as furnishing the elements required to determine whether a given plant could be advantageously cultivated in a given country. But these means were all more or less fallacious, and might have led to serious mistakes. Mean temperatures are useless to cultivators unless they repre¬sent what takes place during the period of vegetation. We do not want to know what the temperature is of seasons when, or MBT Shoes Clearance of places where, plants do not grow, unless for the purpose of determining MBT the amount of winter protection which they may require; and all indications of climate in which the dormant season is mixed with the growing season only mislead.
although a very much lower amount is suitable afterwards; a remark that is chiefly applicable to the natives of what are called extreme climates, that is to say, where a very liigh summer temperature is followed by a very low winter tempera¬ture. Such countries are Persia, and many parts of the United States, where the summers are excessively hot, and the winter's cold intense. The seeming impossibility of imitating such conditions artificially will probably account for many of the difficulties we experience in bringing certain fruits, the Newtown Pippin, the Cherry, the Grape, the Peach, and the Almond, to the perfection they acquire in other countries. 153 The great point to attend to in these considerations is the extremes of temperature to which plants are subject when growing; for this reason the calculations of M. Boussingault have less value than might have been anticipated. This dis¬tinguished French writer upon rural economy proposed, some years ago, a method of determining what amount of HEAT a plant requires, in order to be enabled to perform the functions allotted to it by Nature. This method consisted in determining the length of time over which a function extends, and also the mean temperature during that period. Thus, if a given plant requires 20 days to ripen its seeds after flowering, and the mean temperature during that time was 10°, it would be assumed that the plant in question requires 200° of heat to complete the ripening process. Or if the period occupied was 10 days, and the MBT Shoes mean heat 10°, then only 100° of heat would be required, and so on. M. Boussingault's method was a great improvement upon the previous modes of computation. Observers had been previously contented with annual or quarterly, or other long INUTILITY OF MEAN AIR TEMPERATURES. means of temperature, as furnishing the elements required to determine whether a given plant could be advantageously cultivated in a given country. But these means were all more or less fallacious, and might have led to serious mistakes. Mean temperatures are useless to cultivators unless they repre¬sent what takes place during the period of vegetation. We do not want to know what the temperature is of seasons when, or MBT Shoes Clearance of places where, plants do not grow, unless for the purpose of determining MBT the amount of winter protection which they may require; and all indications of climate in which the dormant season is mixed with the growing season only mislead.