HOMOTYPOSIS m THE VEGETABLE KINGDOM. 
313 
only about three ! In fact, besides being extremely crowded a process of selection 
had gone on in the transit. From examination of the uninjured plants, I think that 
five capsules a plant would be more than the average of these popples before packing, 
and that at least one to two capsules per plant were destroyed on the journey. 
Accordingly, I do not consider that much weight should be given to the results of 
this series, but I felt bound to include it as I have included all the series dealt 
with, even when I hold them to be really unsuited to the present investigation. 
If we consider the two methods of dealing with Series (ii.), i.e., that of including 
all possible pairs, and that of including jDairs in which no capsule was repeated, we 
find that no very sensible change is made in the mean or variation, but a rather 
greater increase in the correlation than might have been anticipated. I think this is 
largely due to unconscious selection in the choice of'pairs, ^.e., we took the records 
for (a) and (6), (c) and (d), &c., as our pairs ; it is quite possible that in recording the 
capsules successive letters would correspond to capsules gathered from tlie same part 
of the plant, and so the members of the pair would be subject to the same or 
somewhat similar conditions of nutriment, light and warmth during development. 
Valuable investigations have yet to be made on tlie relative degree of resemblance of 
leaves or seed-vessels coming at random from the same tree or plant, and coming from 
the same branch or shoot. The effects of position on the individual undoubtedly 
produces some differentiation, and all we can hope to do at present is to get round 
numbers approximately describing the degree of resemblance of these theoretically 
undifferentiated like organs. 
If we exclude the Chelsea series, we have for the 
Wild poppy.'4983 
Shirley poppy.'5238 
Mean . . . . '5110 
For the four series of trees we have 
Ash. . . . 
Chestnut . 
Holly . . . 
Beech . 
. . -3918 
. . -5284 
. . -5035 
. . -5699 
Mean . 
. . -4984 
So far as the seed-vessels of poppies and the leaves of trees are concerned we have 
a degree of resemblance in undifferentiated like organs which approximates to the 
value '5. 
2 s 
VOL. CXCVII.-A. 
