224 BOTANICAL GAZETTE ' [apeil 



Nearly all of the undergrowth has been removed and the forest cover 

 is not dense. 



July 15-23 

 (8 days) 



Amt. evaporation, Station 5 -ji .6"^ 



Amt. evaporation, standard 136 -9 



Comparative evaporation 52 . 2% 



When this record is compared with that of Station 4, we see that 

 the further development of the trees to true forest proportions reduces 

 the evaporation near the soil by an additional 10 per cent. 



Station (5.— Forest on the Joshua Jones farm along the "short road" 



to Huntington, o . 5'^'" east of the Car 

 gently to the northwest ; altitude 50™. 



The land slopes 



(fig 



The principal trees are Quercus priniis, Q. velutina, Castanea deniata, 

 Acer rubrum, Betiila lenta, and Fagus americana. The shrub layer 

 is dominated by Kalmia latijolia, tree seedlings, Sassafras sassafras, 

 Azalea nudiflora^ Viburnum acerifolium, Cornus alternifolius, and 

 C. floridd. The herbaceous plants are Chimaphila maculata, Dryop- 

 teris acrostichoides, Galium circaezans, Aster cor dif oliiis , Leptorchis 

 hhi folia, Peramium pubescens, and Phegopteris. 



Jtme June June June 24- Total 



. . S-io 10-19 19-24 Julys ■ (27 "*>■*' 



Amt. evaporation, Station 6 . . 49. 3" 92.1" 37.6<^= 50.0" 229.0" 

 Amt. evaporation, standard.. 102.2 207.3 112. 6 '148.8 570.9 



Comparative evaporation 48.2% 44.4% 33.4% ^2. 6% 401% 



The important difference betw^een this station and the last is the 



undergrowth. When the record was started the trees were 

 ng to leaf out. Thp e-fTe^rf r>f fh^ ^r,nr-(^c^A <ihac\e. and 



just beginn 



shown 



reduction m evaporation 

 When this record is com 

 the last two weeks. It 



as reiori 

 stratum 



t>Te 



100 per cent, to about ^3 per cent, when the climax 



n 



Station 7.— Ravine forest just south of the "North lot" of the 

 t^amegie Institution, about 0.=*- west of Station i: altitude lo"; 



