444 J- ARTHUR HARRIS AND JOHN V. LAWRENCE 
comparable except that in it the data are arranged according to the 
freezing point lowering of the juices of the leaves of the host plant. 
-OJO- T 
? ? 
-0.80 ■ 
o o 
- 0.90 - o I 
~/.00 - 
-J.IO -_ 
-1.20 - 
-1.30 - 
-/.40 - o o o 
-/.SO - 
-1.60 - r 
-/.70 - I 
-1.80 - 
-/.SO - 
-2.00 - 
Diagram i. Freezing point of extracted sap of parasite (solid dots) and of 
host (circles). The determinations are arranged in order of magnitude of the values 
obtained from the parasite. The length of the lines connecting the dots and circles 
indicate on the scale to the left the amount of the difference between the freezing 
point of the sap of the two organisms. The mean value for the parasites is shown 
by the solid bar, that for the hosts by the broken line. 
The differences between parasite and host are indicated by the lengths 
of the bars connecting the circles and solid dots. 
With but five exceptions, of which one is trivial in magnitude, the 
