INHERITANCE THROUGH VEGETATIVE PROPAGATION. 17 



acidity of the Lisbon fruit is equal to the highest acidity of the Open 

 strain fruit. In May 1921 and January 1922, while the results for 

 the fruit from the two strains overlap, the chances are exceedingly 

 high that the difference is significant. The highly significant dif- 

 ference shown favors the conclusion that the acidity of the Lisbon 

 strain is greater than that of the Open strain. 



Another marked difference in acidity exists between the fruit of 

 the Lisbon and Dense Unproductive strains. In each group of 

 samples the highest acidity shown by the fruit of the Dense Un- 

 productive strain is only slightly higher than the lowest acidity 

 shown by the fruit of the Lisbon strain. In each case the chances 

 are high that the differences shown are significant, and it seems 

 probable that this difference is characteristic of the strains. 



A difference may also exist between the acidity of the fruit of the 

 Bull strain and that of the Lisbon. Although there are but three 

 comparable groups, the May 1921 samples show great odds that the 

 Lisbon fruit is more acid than that from the Bull strain trees. The 

 odds are not so great in February 1921 but are still in favor of the 

 Lisbon strain, while the January 1922 samples show no appreciable 

 difference. With two high chances out of three, a difference may 

 exist. 



One other difference in acidity in this variety may be classed as 

 probable. With a single exception, the fruit of the Dense Unproduc- 

 tive strain has a higher acid content than that of the Open strain. 

 The two trees compared when the monthly samples were taken, 

 showed this difference to some degree, but the chances that the 

 difference was significant were not high. In the November 1920 

 group the lowest acidity of any of the Dense Unproductive strain 

 fruitis distinctly higher than the highest acidity of any of the Open 

 strain fruit. The chances that this difference is significant are very 

 high. This difference is strongly evident in the January 1922 group, 

 and to a smaller extent in the February 1921 group. The May 1921 

 group shows practically no difference in acidity. In four out of five 

 cases the Dense Unproductive strain is higher in acidity than the 

 Open strain. 



Several differences in the percentages of rind, between the strains 

 of the Lisbon variety, are worthy of consideration. 



The tree of the Bull strain sampled monthly bore fruit with a 

 higher percentage of rind than that borne by any of the other trees 

 sampled at that time. The greatest difference shown was between 

 the Bull and Open strains, and the chances are high that the differ- 

 ence shown is significant. This difference is maintained in the 

 groups of samples taken later (Table 4). In the May 1921 group 

 the lowest figure for the Bull strain is higher than all but two of 

 those for the Open strain, and in the other two groups the over- 

 lapping is slight. There seems to be little doubt that a probable 

 difference in this respect exists. 



The fruit of the Bull strain tree sampled monthly is also higher 

 in rind than that of the Dense L T nproductive tree. This difference 

 is again noticeable in the February and May groups of the later 

 samples. In the May group there is no overlapping of samples, the 

 lowest proportion of rind in any of the Bull strain fruit being nearly 

 2 per cent higher than that in the highest Dense Unproductive fruit. 

 The January 1922 group shows no difference, however. 



