6 a 



week' values exhibit the march of the cljmatie conditions at 

 each of the various stations in somewhat greater detail than 

 do "'"'1" 'iiorresponding '^'=^rj'='s of four-v;eek values, sine t lie 

 latter represent overlapping periods, and the former will 

 therefore be made the basis for a sonaewhat detailed and 

 comparative discussiO' of ^h^ climatic conditions for the 

 various stations. Temperature will receive attention first 

 and evapora,tion and light will afterv/ards be considered to- 

 gether. In each case, ■^'le general characteristics i^conmon 

 to nst or all of the stations) of the seasonal march of the 

 condition considered will be brought out, after which attention 

 v/ill be given to peculiarities of the v:.lues for individual 

 stations. 



Temperature conditions 



The graphs represen'i'ing temperature conditions present 

 the seasonal march, at each of the various stations, of the 

 average daily relative physiological index. '^he most obvious 

 general characteristic of this index value is tliat it is high 

 in summer and low near the beginning and end of the season, for 

 all stations. Graphs of similar form are obtained when daily 

 means and remainder summations are correspondingly plotted but 

 the discrepancy between the midsummer values and those for the 

 beginning and end of the season is much raorejpronounded jn 

 the graph of physiological index values There employed) than 

 in either of the others. The second general characteristic 

 of all the graphs of the plysiological index of temperature 

 is that they possess two maxima, both of 7/hich have about the 

 same magnitude.. The first occurs in the las'^ two weeks of 



