30  GOoRTNER AND HarrIS: FRUITS OF PASSIFLORA GRACILIS 
The arguments in this paper are in all cases based upon the 
comparison of the samples of abnormal fruits with their checks. 
The differences averaged and discussed in the text are in all cases 
taken as abnormal Jess control, the sign of the difference being 
positive when there is a greater depression of freezing point, 
higher osmotic pressure, or higher average molecular weight, in 
the abnormal fruits. 
ANALYSIS OF DATA 
The large table gives the essential constants for the various 
lots of fruits. The section to the left contains the data for the 
samples of abnormal fruits, that to the right those for the checks. 
Consider first the properties of the juice in fruits differing only 
in the structure of the wall. 
Series (b) and (c) may be regarded as transitions between the 
trimerous and tetramerous fruits. 
In two cases A is higher and in one lower sien 3 in the control 
samples. The negative difference is only —0.012° and is but 
twice or thrice the estimated experimental error. The mean 
difference in depression of the freezing point is + 0.035°. The 
differences in pressure in atmospheres, P, have the same sign as 
the differences in depression. In one the difference is — 0.144, 
in the other two it takes the more substantial values of + 0.638 
and + 1.143; the mean of the three is + 0.546. The average 
molecular weight is in all three cases lower in the abnormal fruits, 
— 7.41, —4.46 and — 9.02 being the values. 
The tetramerous fruits (eight external sutures, four placentae, 
no prolification), class (d), are represented by nine samples, divided 
as follows: 
eee as | ge Steen Site Mean value of 
5 differences 
fs WIND 2 OREN rio. ara 3 + 0.002° C, 
Mea tite | 2 | 7 2.81 
Pie ra eas es 6 3 - 0.024 
Combining (0), (c) and (d), we have, with headings as above, 
+ 0.010° C. 
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