61 



evaporation valii'^- '''^'■^ +-n ; o stat''^''' ■■■>'=e'~'_^ ^■■' '- vp v-^r 'r\rc\- 

 e'nough to affect the plaiits. Leai-px-od-uct at Monrovia, follows 

 the graph of temperat fare index values in general. In the r,eriods 



■j,g^; -,,„ ;^,^T:,v,o 1^ T,v':o !-;_ ii-a-T 13, and -Tiily ?7 !-'p-! .; 



evaporation probably depress the rate of ^e af expansion since 

 the temperautre Indices for these periods are well above the 

 seasonal av'^^--'^ for the st-^te, ' ^O'^ ^.-p-.p reason ^^^-^ apparent 

 from the climatic graphs, the period beginning Aug. 10 shoves 

 a relatively low value of leaf--orodiict and the perJ ,":inning 



Sept. 21 a rel ■•^''' ' ■^^l '' h' rrh -"^^lue. T^i-.p -.-\ir^-r\^ ^r^^'" ^ .-\-i- icl"''™? 

 shows a number of peculiarities -vhich cannot be a^dequately cor- 

 related T:ith the climatic d&ta. Leaf-product has a relatively 

 lower val"^ ^'•^'^ pp -•,-■! beginning June 19 and a r^i ''■■ ^i '"■'^>' 



higher value for the oeriod beginning July 17 than -.voiild b-: ea.- 

 pected. The plant graph lies well below the temperature graph 

 from ■'■h^ ~"riod beginning Aug. 14 to the ^n"! of the "-epscr; due 

 probably to low values of sunshine intensity. 'Ilhe light data 

 are not available for this station, however. The rise in rate 

 "--* ] eaf-produc-^^ ':-■■' ^rnv the period beginning IJay 23 to the period 

 beginning. June 6 may be explained by the corresponding fall in 

 evaporation rate, althoiigh this fall is sljght. Baltimore shows 

 relatively hi-^i. vi;.:.u.ey uf leaf-product for the periods beginning 

 June 25 and July 9 as would be ex acted from the fact th-t the 

 temr;erature value is hi^Th and the evaporation lov,' for these 

 eerioas. one ■: ' ■ -oroau ' .e 



period beginning Aug. 6 is not clear. Darling'-on is :Ti stinguish- 

 el from th-^ rest of t: " ' ' ", very high leaf-product for 



the. period beginning July V "'-^ ralue l being 295, 



