[51]

The short-faced & long faced Tumblers have diverged from Tumbler,

[annotated sketch]

pully sins spit Sh-face Tumb long T Tumbler Dovecot

When we put horned Bull to Hornless cow & horned calf the cow [illeg] but the horns do not appear till nearly adult calf ½  grown. so with bigger horn, so make link, which do not appear till embryo of same size.— Potentially on germ.

Potential embryo of fish & Mammal at no time alike
Horns cd not appear in embryo, but limbs cd appear longer, supposing that we had means of measurement but there is no reason to suppose they do.

Dog
Cat
Hyen
Common parent of Carniv

Rumin
Pachyderm
Common parent of Pachyderm & Ruminant
Alteration in some way in embryo
Common Embryo

This is explanation of longer greater similarity of Embryo of Pig & Cow

[six family tree sketches for various pigeon breeds.]

Hyenas
Dog
Dog
Cat
Cyner


Ruminant
Pachyderm
Eocene Pachyderm Rumin

Generally as Selection is slow & much is required, the most diverse form will have branched off soonest

If only a small percentage of change say 1/1000th affected young within a week after development before arriving at a certain point of change.

12

[51v]

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[remainder not transcribed]