43 for the 2-":eek period 'beginning Sept. IE which was the 

 last -full period for this station, "before the occurrence of 

 a killing frost. The p: •-:t outstanding characteristics of the 

 Oakland season in respect to this temperature efficiency 

 graph, as compared with the seasons at the other stations, 

 are fl) general lo-- values of thfe ■•-■h-' biological temperature 

 index, (2) short duration, owing to the occurrence of late 

 spring and early fall frosts, and (3) the early occurrence 

 of the maxini-;- . '^'■"•>- markeci l i -^ferences "between the Oakland 

 graph and those for the other stations here dealt v;i th are 

 no doubt largely due to the relatively high altitude of this 

 station as compared v,'ith the altitudes of the others, bs has 

 been mentioned by McLean in his comparative study of the 

 Easton and Oakland seasons based on these same data, 



Lenving the one Oakland cu"^ 'f accouiit, the other 

 eight temperature efficiency graphs may be described as a 

 single generalized graph, in the following general terms. 

 Seginning ^ra. th Relative index value of aboi;*^ pn (for the first 

 -lart of May) the graph rises to a maximum (about 150) fcr the 

 first part of July, falls slightly and rises again to a second 

 maximum of about the same value as the first^ for -'■^-^ first 

 part of August, and .finally falls to a minimum value of about 

 50 for the last period of the frostless season. That the 

 initial values are not ir.-nv • c. no doubt '■^■'•^ t'~ ■^'•-e fact that 

 the various series of cultures were not started until some™ 

 v/hat later than the beginning of the ^sasasBESEt^Sil:^ frostless 

 season. foee McLean's paper cited above ^ 



