OSMOTIC PRESSURE OF TISSUE FLUIDS 445 
parasites show distinctly greater freezing point lowering than their 
hosts. In other words, their tissue fluids are characterized by higher 
osmotic pressure. 
H.60 - 
~/.7P - 
-/.80 - 
-/.SO - 
-2.00 - 
Diagram 2. Determinations of freezing point of extracted sap of Loranthaceae 
and hosts, arranged in order according to the values for the latter. Compare explana- 
tion of Diagram i. 
Having recourse to averages for more exact comparison of the 
seven species of parasites with their hosts^^ we find 
1° The means are based upon the parasites which are accompanied by host 
determinations only, not upon all the freezings for the sap of the loranths. Thus 
the means for host and parasite are quite comparable. 
The bars indicate that the values of A and P are averages. 
