B. TERRESTRIAL PHYSICS AND METEOROLOGY. 77 



zero and ninety degrees as the extreme cases, while it is on 

 the average in winter abont sixty degrees, and in summer 

 either forty or seventy degrees. The angle depends, to a 

 certain extent, upon the position of the centre of highest 

 temperature, being smaller according as this point lies more 

 to the east of the barometric minimum. While these rules 

 hold especially for the coast of Scandinavia, similar rules 

 have been determined for Finland ; and it is evident from the 

 experience of other meteorologists that Baron Maydell has 

 but given definite expression to a law that applies very gen- 

 erally throughout the terrestrial sphere, changing only the 

 notation when we pass from the northern to the southern 

 hemisphere, and also as we pass from the equatorial to the 

 temperate regions of the earth. The angles determined by 

 him are evidently aifected by the configuration of the coasts 

 of Northern Europe, and quite different values must obtain 

 in our own country. Bull. Centr. PInjs. Observatory, St. Pe- 

 tersburg, December. 1873. 



EBEEMAYEE OX A NEW TEXT-BOOK OX CLIMATOLOGY. 



The new work of Lorenz and Rothe on climatology has an 

 important bearing upon all questions of the cultivation of 

 land, whether pertaining to forestry, or to agriculture as or- 

 dinarily understood. This work teaches us how the study 

 of climatology must be followed in order to deduce valuable 

 practical consequences therefrom. Thus far, we believe, the 

 study of meteorology and climatology in its relations to ag- 

 riculture has been shamefully neglected, even in the so-called 

 agricultural colleges, and the volume in question will we 

 hope soon be translated from its original German, and adopt- 

 ed as a text-book in our own country. The special value of 

 this work, according to Ebermayer, lies' in the fact that it 

 gives no simple dogmatic climatological recipes, but rather 

 leads the reader systematically from the simple phenomena 

 to the more complicated ones, and makes him acquainted 

 with the causes of the manifold climatic differences that are 

 found upon our earth, enabling him finally to attain a com- 

 plete understanding of the climatic peculiarities of any given 

 place from the ordinary instrumental meteorological records. 

 The book, which comprises nearly 500 pages, treats of the 

 following climatic elements : namely, light, warmth both of 



