3'/ 



daily mean tei^x^t; mature for the longer i^ericdvS was obtained by- 

 taking the mean of the two average daily means for the two-v/eek 

 period:-. 



""'-- graphs, shown in plates IX to XIII, present graphically 

 certain of the data given in the tables. In all of the graphs, 

 the ordinates represent magnitudes of the plant and dljmatic 

 ralative values and tii& abscissasrepresent. the t i..ne ■' -"' ':;t 

 year. The ordinate scale is given at the left of each, set of 

 graphs for convenience in reference, and the dat-^s of the be- 

 ginningsof successive culture periods are shown on the base line. 

 For the first two-week period for Oakland, thus, the ordinates 

 shav the average daily relative values of the plant and cli- 

 matic measurements for ^'— two-week period, beg , "a*^ P'^. '^'-^e 

 100 line of the ordinate- scale is the value, as was -oreviou-sly 

 noted, of the seaso-al average for the state of each of the plant 

 and climatic measurements taken. An explanat j on of the method 

 of representing each of the measurements shown in the graphs 

 is given in th-^ legend ' ^.late XIII. 

 The t v^ o - week c 1 i ma 1 1 c_ d a t a . 

 3 ntrgguctory . The two-Vveek climatic aste consists of the rela- 

 tive ueily averages cT the temperRture index, avrporstion index, 

 anc. sunshine intensity 2<jv b series of consecutive periods exten- 

 ding over the entire season, each period being about 14 deys long. 

 These values thus furnish a continucua record of the ser.scn at 

 each Etrrtio.'i. The four-v.eek periods, ho\iever, overlsp, each one in- 

 ciuaing the last tv.o we-^s of the preceeding ana the first tv.G 

 weeks of the following period. V.hile the climatic averages based on t: 

 four-v.e«k apt? form f> smoother curve then uo the twc-weck values, 

 small variations in the conditions arc to s great extent obscured 

 by averaging the overlapping periods. The series of tvio- 



