u 



presentation of the Data. 



Two aietiiods of presenting the data of the experiment have 

 been emplo7/ed in this paper. The relative ntun'bers, derived as 

 n6ted above, have been p\'rr--n in tables, together "^i ff-' ^'- <= ^^^es 

 of the first and last days of each culture period and other in- 

 formation including the length of the neriod, the number of plants 

 in the culture, etc. Also, a set of graphs is -oresented ^'nrmr- 

 ing grpahically certain parts of the information given in the 

 tables. 



The t- bles of plant and climatic data for the various 

 stations employed are shov/n in plates I-VIII and will be de- 

 scribed below. "Inhere are, in addition, several tables given 

 in Jtihe text ^vhich will be described elp-^whp.re. Plates T-*^ITt 

 contain 26 tables in all. Nine of these, shown in plates I-ITI 

 inclusive, contain the plant and climatic data for the two« 

 week culture periods for the exposed stations; ^''-r-^ ^ shown in 

 plates IV-VI inclusive, give the data for the &ur-week cul- 

 ture periods for the es^posed st-.tions; four, shoLvn in plate VII, 

 give the data "for th® two-and -FciT''---ve-> .-.-■!+::-■;•.. periods for 

 the covered stations at Oakla d and Baltiniore; and four, shown 

 in plate VITI give the da' a for the tv/O-and four-week culture 

 periods for +^'-e covered station at ■Sastoii ^i-^-'f -rnv fi-e Baltimore 

 Forest Station. 



Tn all of the tables, '-' "irst line giv=;s the name of 

 the pla-ce <?. *• ^'•'"'jch the .. '' ■,■*■'-'; e lengt 



ture periods (whether two-or four-week) , and the character of 

 the exposure of the plants, that is, whether the sta'-ion 's ex- 



