[232]

July 22/ subterraneum Trifolium

Young— Flower head — not fully open (?) or possibly just begun to fade??

standing vertical — stem tied

Roof

[data not transcribed]

(The peduncle did not become more than rectangular with shoot) & flower only at ∟' angle —

(N. B the lifting up of stick & shoot prevented the peduncle from becoming perpendicularly down)

[232v]

[right side of page excised. The text is here combined with that of the excised half in CUL-DAR209.11.233v]

753 (610

Ch XII

Gen Con

cross-fertilisation are transmitted in the case of by plants to the next generation;

and judging from the varieties of the common pea to

many succeeding generations. But this may merely

be that the crossed plants of the first generation are

extremelyvigorous, and that they, transmit their organs like any other character to

their successors.

(Notwithstanding the evil which many plants suffer

from self-fertilisation they can be thus propagated by this means under favourable

conditions for many generations as shown by [illeg] some of my experiments,

and more especially of by the survival during at last

half-a century of the same varieties of the common

pea & sweet-pea, as well probably as of several other

exotic plants which are never or most rarely cross-

-fertilised in this country. But all these plants, as far

as they have been tried, profit greatly by a cross with

a fresh stock. Some few plants, for instance Ophrys

apifera have almost certainly been propagated in a

state of nature for rendered of thousands of

generations without having been once intercrossed

[Cross and self fertilisation, p. 439.]

[233]

subterraneum z

Head withered inclined 36° below Horizon stem tied.

[data not transcribed]

[233v]

[see page 232v above]

[234]

First Flower

On Roof

[data not transcribed] (All used)

[234v]

"a result which is probably effected by mixing the slightly-different physiological units of slightly-different individuals."* (a) But we must not allow this or any other highly generalized view, or the more probable analogy of chemical affinity, to conceal from us our ignorance. We do not know what is the nature or degree of the differentiation in the sexual elements which is favourable for union, and what as in the union case of distinct species, is injurious. We cannot say say why the individuals of certain species profit greatly, and others very little by being crossed. There are some few species which have been self-fertilised for a vast number of generations, and yet are so vigorous that they can compete successfully with a host of surrounding plants. Highly self-fertile varieties

[Cross and self fertilisation, p. 458.]

[235]

First Flower Roof

[data not transcribed] (used)

Tracing IV A

[235v]

act in this manner both with

, parts of Europe, in the U.

& therefore probably in all p

which actually depend on the entire

=ation, the result of holes being bitten in sterile

are capable of fertilizing

there can be no cross-

The extent to which hum

is surprising: a remarka

near Bournemouth, wh

with Erica tetralix grow

walk and every now & then

I had got a handful

[Cross and self fertilisation, p. 426.]

[236]

Monday 29' T. subterraneum (First flower)

[236v]

737 (23

Ch XI

lyx. In these several cases the perforations

ide, but in Antirrhinum majus little

e made on the lower side, close to the

rance which represents a nectary, and

n front of & close to the spot where the

(But the most remarkable case of skill

un to me, is that of of the manner in which perforation of the flowers of Lathyrus sylvestris,

my son Francis* (*Natures Jan 8. 1874

r in this plant is enclose within a tube,

[Cross and self fertilisation, p. 428.]