HOMOTYPOSIS IN THE VEGETABLE KINGDOM. 
305 
but for more than three-quarters of the trees l^y Miss Fry herself The labour of 
tabulation and the deduction of the constants was undertaken by Dr. Lee. 
Series (ii.). Dorsetshire Hollies. 
This series of 26 leaves from each of 100 trees was gathered .and counted by 
Miss C. D. Fawcett, B.Sc. It differs in several important respects from Miss Fry’s 
series. As it came from the neighbourliood of the sea, Ijy Lyme Ilegis, we might 
expect a considerable difference of environment ; the trees were chiefly hedgerow 
trees. They show, however, a lower mean number of prickles than the Somersetshire 
series, which embraced a large element of wood trees. I think the series is less 
homogeneous than the Somersetshire series. In particular. Tree 91 contriljiites the 
almost abnormal series of 24 leaves with 1 and 2 leaves with 2 prickles. The lump 
at the end of the frequency distrilnition is })ractically due to this one tree. I do not 
feel able to reject it entirely, but I give the numerical constants as determined with 
and without it. I take it that of the two observers the personal equation of one 
tended rather to emphasise the need for a mathematically “random selection” of 
trees, and the personal equation of the otlier to emphasise the importance of a 
hotanically “homogeneous group” of trees. The result has been the increa.se of 
correlation and variability in the first, and their decrease in the second case. 
Probably tlieir mean is not far from the truth. It is noteworthy that tlie ash trees 
from Dorsetshire and Monmouthshire, although exhibiting a like substantial difference 
of environment, were far more alike. 
The tabulation and reduction of this series is also due to Dr. Lee. I now 
summarise the results as before :— 
Kesemhlance of Holly Leaves from the same Tree. 
Series. 
Number. 
Mean number of 
prickles. 
S. D. of prickles. 
Correlation. 
Trees. 
Leaves. 
Pairs. 
Somersetshire (i.) 
Dorsetshire (ii.)«. 
„ (ii.)/j. 
100 
100 
99 
2600 
2600 
2574 
65,000 
65,000 
64,350 
15-2935 + -0379 
13-4373 + -0497 
13-5622 ± -0474 
2- 8655 ± -0268 
3- 7595 ± -0352 
3-5661 ± -0335 
-3648[± -011.5] 
-6423[+ -0078] 
-5985 [± -0085] 
Mean (i.) and (ii.)« 
jNIean (i.) and (ii.)5 
— 
— 
— 
14-3654 
14 - 4278 
3-3125 
3-2158 
-5035 
-4816 
is the Dorsetshire series, excluding tree (91). 
In round numbers accordingly the number of prickles on the holly leaf is 14'4, the 
standard deviation 3’3 prickles, and the degree of resemblance ‘5. The holly thus 
falls between our results for the ash and the chestnut, one series approaching our 
Buckinghamshire ashes, the other the group of mixed Spanish cliestnuts, being 
somewliat in excess of the Buckinghamshire beeches. 
o 
2 R 
VOL. CXCVII,—-A. 
