[23]

(7

into their burrows day to day  appears to have become habitual action; for worms kept kep in pots, covered by glass-plates, over which were spread sheets of black-paper, & placed before a N. E window remained during the day time in their burrows that the air on the damp earth must have been humid, & came out every night, for a week. A very little The air about the damp No doubt a very little light may have entered between the sheets of glass & the blackened paper & the glass, but we know from the trials with the lantern with coloured glass that worms are quite indifferent to a small amount of light.)

[23v]

391

Petunia

self-fertilised for four generations, in comparison with plants of the old stock when either and or self-fertilised for five generations; the flowers on all these plants having been left to be freely crossed by insects or to fertilise themselves. For the Westerham-crossed plants produced capsules on an average more than twice as heavy as those produced by the plants self-fertilised for five generations, and nearly twice as heavy, as those of the plants intercrossed during the same number of generations. The Westerham-crossed plants were also much taller and    both   [bottom of page excised]