OSMOTIC CONCENTRATION OF TISSUE FLUIDS 
The averages for the Long Island series^ have been calculated for 
individual habitats. The averages for both trees and shrubs and for 
herbaceous plants may be compared with the individual Blue Moun- 
tain habitats. The means of the accompanying tables, VII-VIII, 
Table VII 
Comparison of Ligneous Plants 
Jamaican Habitats 
Long Island Habitats 
Ruinate 
13-05 
13-34 
Beaches, coastal sand dunes and 
marshes 
Ridge forest 
11-54 
14.64 
Dryer woods and open fields 
Leeward ravines 
10.83 
Windward habitats 
9-73 
14.07 
Permanently moist localities 
All habitats 
11.44 
14.40 
All habitats 
Table VIII 
Comparison of Herbaceous Plants 
Jamaican Habitats 
Long Island Habitats 
Ruinate 
Ridge forest 
Leeward ravines . . . . 
Windward habitats . 
All habitats 
13.62 
10.04 
9.27 
10.41 
Beaches, coastal sand dunes and 
marshes 
Dryer woods and open fields 
Permanently moist localities 
All habitats 
show that with the exception of the herbaceous plants of the ruinate 
there is no habitat of the Blue Mountain region which exhibits an 
osmotic concentration of the leaf sap of the species constituting its 
flora as high as the lowest mean found in the Cold Spring Harbor series. 
The herbaceous plants of the ruinate^ — the most xerophytic of the Blue 
Mountain habitats — show a concentration slightly higher than those 
of the Long Island habitats which are constantly moist, i. e., fresh 
water bogs, lake shores and springy hillsides. 
2 The values given for Cold Spring Harbor are preliminary averages of deter- 
minations, not of species means, made in 1914 by Harris, Lawrence and Gortner. 
They will be replaced later by averages based on far larger series of determinations 
made in 1915 by Lawrence and Harris, and on subsequent determinations by Harris. 
