is above 40° ia the shade. As they produce their flowers on tlio previous year's 

 growth, good care must be taken in pruning them to remove none but the oM 

 wood or ugly cross shoots that spoil the shape of the jilaut ; a liberal su])ply of 

 water is absolutely necessary for the full development of its long spikes of snowy 

 flowers. 



CLIMATOLOGY. 



BY A CONSTANT READER. PHILADELPHIA. 



The contributions of this country towards the science of climatology and physical 

 geography are matters of which we Americans may justly be proud. The Espynn 

 theory of rain is the only one which possesses all the requisites of a law of 

 nature. Lieutenant Maury's Charts of the winds and currents are of world wide 

 fame. Professor Coffin, of Lafayette College, Pa., has contributed to the Smith- 

 sonian Institute, a memoir on the winds of the northern hemisphere, which is a 

 fine specimen of laborious and philosophical investigation ; and we have from the 

 pen of Lorin Blodget, of Washington, two memoirs on the climate of the United 

 States, which may rank with the best European reports on the subject of cli- 

 mate. 



The first of these is contained in the Patent Office Report for 1853, and is a 

 masterly discussion of the climatic conditions requisite for the successful cultiva- 

 tion of the great staples of our country — wheat, maize, the vine, tobacco, cotton 

 and sugar. 



The second is just published by the authority of government at Washington, in 

 the large quarto volume entitled, " the Army Meteorological Register for twelve 

 years, compiled from the observations made by the officers of the Medical Depart- 

 ment of the array at the military posts of the United States." 



These and other authorities have been most skilfully discussed and investigated, 

 and their results are presented in a tabular shape, and in charts containing the 

 regions of equal temperature and equal rains. 



No country in the world possesses such facilities as our own for such an in- 

 vestigation. Extending over the whole breadth of the continent from east to 

 west, and through 25 degrees of latitude in the southern portion of the temperate 

 zone; the broad plains, the high table lands, the long ranges of mountain and 

 coast, give us every variety of climate that can be found in our zone. 



The following statements, compiled from the Hyetal or rain map of the U. S., 

 will no doubt interest many of your readers. 



The eastern half of the United States — that portion lying south of lat. 48° and 

 east of a waving line, the mean direction of which passes through the meridian 1)5° 

 west long. : a region as large as all Europe this side of Russia, and south of 

 the Baltic — is the most equably and copiously watered portion of the world of 

 al extent and compactness. 



The southern part of this region — comprising the States of Florida, Georgi 



