HOMOTYPOSIS IN THE VEGETABLE KINGDOM. 
301 
Series (ii.). Mixed Spanish Chestnuts. 
My second series consists of 26 leaves from each of 104 trees. These were 
gathered in a variety of neighbourhoods. Many of these were young trees. 
In the case of nearly 50 sets, the trees were 23ollards from old stumps with aljout 
15 years’ growth ; some of the others were from fine old trees, and as a result 
we have many districts and many ages combined. I have to thank Miss C. D. 
Fawcett for sets from the neighbourhood of Hampstead, Miss Grace Lee for sets 
from that of St. Albans, Miss Charles for sets from the neighbourhood of Dorking, 
while about half the series was gathered l^y Mr. PtOBERT J. Parker from his 
chestnut woods at Haslemere. The counting of the veins was undertaken ])y 
Miss M. Notcutt, while the tabulation and numerical reduction are the work 
of Dr. W. P. Macdonell. The series being mixed, the varialiility is higher then 
that of the first series and thus the labour spent on it was even greater. 
The following table gives the general results :— 
Pesemblance of Spanish Chestnut Leaves from same Tree. 
Series. 
Number. 
IMean number 
of veins. 
S. D. of veins. 
Correlation. 
Trees. Leaves. 
Pairs. 
Hampden . 
Mixed . 
100 2600 
104 I 2704 
6.5,000 
67,600 
41-07.35 + -0775 
41-2145 ± -0840 
5- 8780 + -0550 
6- 4780 ± -0594 
1 
-4655['+ -0104] 
-5913[±-0084] 
j\Iean . 
— . — 
41-1440 
6-1780 
-5284 
We note at once that the mean numljer of veins for the forest trees and for tlie 
mixed grou]j is sensiljly the same. On the other hand, the varial)ility mid the 
correlation differ very considerably. The latter is sensilily higher than the ’4 
obtained for the leaflets of tlie ash. I should be inclined to consider tliat the 
heterogeneity of the mixed series is at the bottom of the difierence between the two 
series, hut there cannot, I think, be any doulit of the greater resemlilance of chestnut 
leaves for this character than of ash leaves in the number of pimue. 
The actual di.striljution of veins in the 5304 leaves examined was as follows: — 
