PBEFACE. 



This Report makes no pretensions to be other than an arrangement and 

 classification of the principal results of the meteorological observations made 

 during the year 2539 (1879) at the meteorological station established l\y the 

 University of Tokio. A good deal of care has been bestowed upon the classifica- 

 tion of these results, especially in the construction of the charts which not only 

 exhibit the more pronounced results in a much more intelligible manner but 

 also invite attention to many relations and probable dependencies which might 

 otherwise remain hidden in the numerical tables. In no other way can a 

 comparison of meteorological conditions be so easily made as by these graphical 

 methods. At the end of the present year it will be possible to construct a series 

 of diagrams representing the combined results of two years' work. These will 

 doubtless take the general form of those here presented, modified by such 

 variations as will undoubtedly occur in the present yenv. 



A study of the changes which are wrought in these weather charts from year to 

 year cannot fail to be of use in determining to what extent the climate may be 

 ■regarded as constant and in revealing, as far as possible, what the normal 

 climatic conditions may be. 



For the liberality with which this volume is illustrated, I wish to express 1 my 

 indebtedness to the Directors of the University, Mr. Kato and -Mr. Hamao, whose 

 constant desire has been that it should be rendered as complete as was possible. 

 I must also bear testimony to the faithfulness with which the original diagrams 

 have been reproduced by the Gengendo Engraving House. In common with 

 its predecessors in this series, this volume is throughout, in its material and its 

 mechanical execution, the product of the country and I may be permitted to say 

 that, in that particular, it is equally with them deserving of credit. 



I must express my thanks to W. S. Chaplin Esq. Prof, of Civil Engineering 

 in the University for the facts concerning the position of the Station and to Mr. 

 Yamagawa, Adjunct Prof, of Physics, who has rendered much valuable aid during 

 the passage of the -volume through the press. 



The Charts are lettered and numbered so as to serve for both this and a 

 Japanese Edition which will be issued. 



T. C. M. 



Tokio, March 1880. 



