PROFESSOK K. PEARSON AND OTHERS ON 
.‘MO 
Gill Index. 
1 . 
»o lO 
o 5: 
1 . 
c. o 
C; cr¬ 
ip O 
1 . 
kO lO 
C: C5 
O Ci 
1 . 
o o 
Ci 
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I . 
c; c- 
c: o 
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1 . 
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o 
c; c- 
ct, c 
1 . 
Z' z 
f . 
17 17 
Ci Ci 
^ 71 
1 . 
17 V.7 
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c: Ci 
71 CO 
1 . 
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1 
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^ To 
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1 
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1 
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X C. 
rH f-n 
rH 
f—' rH 
rH 
^H ^H 
71 71 
71 71 
71 71 
71 71 
71 71 
71 71 
71 71 
71 71 
71 71 
Frequency . 
1 
]_ 
4 
7 
13 
]8 
30 
39 
55 
7S 
10] 
90 
100 
93 
73 
I . 
17 i7 
1 . 
i7 1-7 
1 . 
1-7 17 
1 . 
17 17 
I . 
17 17 
1 . 
17 i7 
1 . 
1-7 17 
1 
1 . 1 . i 1 . 
17 1.7 17 17 1.7 1-7 
1 . 1 . r . 
17 1-7 17 1-7 1-7 i7 
1 . 
1.7 1.7 
Ci Ci 
Ci Ci 
Ci Ci 
Ci Ci 
Ci Ci 
Ci Oi 
Ci Ci 
Ci Ci Ci Ci O Ci 
C; Ci 
c; Ci 
Ci Ci 
Ci Ci 
Ci Ci 
Ci Ci 
Ci Ci 
Ci Ci- Ci Ci Ci Ci 
Ci Ci Ci Ci Ci Ci 
-- r-.. 
Ci O 
'w rH 
rH 71 
71 CO 
CO 
i7 
W W X X o 
C- O O r- M 
71 CO 
CO -f 
71 CO 
CO CO 
CO CO 
CO CO 
CO CO 
CO CO 
CO CO 
CO CO CO CO CO CO 
CO -e ^ ^ 
-T -r 
-7 -r 
Frequency . 
66 
63 
39 
43 
31 
43 
]5 
20 10 9 
18 3 
3 
4 
1 . 
»o i7 
I . 
17 1-7 
I . 
17 L7 
1 . 
17 17 
I . 
i7 1.7 
10 17 
1 . 
1.7 17 
1 . 
17 »7 
. . 
1-7 l7 
1 . 
17 17 
1 
17 17 
I . 
17 17 
Ci Ci 
Ci Ci 
Ci' Ci 
Ci Ci 
Ci Ci 
Ci Ci 
Oil o. 
Ci Ci 
Ci Ci 
C. Ci 
Ci Ci 
Ci Ci 
iotal. 
Ci Ci 
Ci Ci 
Ci Ci 
O Ci 
Ci Ci’ 
C: Ci 
Ci Ci 
Ci Ci 
C; Ci 
Ci Ci 
Ci Ci 
Ci Ci 
-r 17 
o 'C 
iC l-r 
X 
X c: 
c- o 
O — 
r^ 71 
71 CO 
CO — 
-r i7 
17 OC 
-f* 17 
17 i7 
l7 i7 
l7 17 
17 lO 
17 17 
17 lO 
Frequency . 
0 
3 
1 
2 
0 
1 
0 
1 
0 
1 
0 
1 
1070 
This distribution is rather irregular and may suggest heterogeneity ; the tail is 
somewhat inordinately extended. But the numerical constants given in the table 
above are (juite comparable with the best of our other series, and are rather better 
than I had anticipated a lyriori, for I expected the diverse stages of growth would 
influence the index as well as the absolute measures. It would be of great interest 
to repeat the series on an artificially grown bed of mushrooms, taking each at the 
same stage. 
It will be seen that the mushroom, with deofree of resemblance of like organs 
about that of the Spanish chestnut, has a variability comparable with that of the 
ash. The variation of the individual is even in such a comparatively simple organism 
more than 80 p.c. of that of the race. It will thus be clear that the mushroom 
takes, so far as our present investigation is concerned, no special place apart in the 
vegetable world, but quantitatively is comparable with highly developed organism® 
like trees. The accompanying table, Table XXII., gives the data for the measurement 
of the gills. 
I now turn to the relation.ships of the absolute measurements, which, as I have 
noted, we have good grounds for believing are much affected by growth. 
The numerical constants are summed up in the folknving table, the dimensions 
being given in millimetres :— 
