[18]

(a)

(I also placed as already stated four flies, on single the glands of the marginal hairs & then of three were moved carried to the centre of the leaf in 35 minutes to an ∠ of 180; the fourth was which was extremely minute was was carried in 3 hours; over in through two 1° 30' 1 ½ hours. (Z) I then placed four little bits of cinder placed on single marginal hairs; one of these in 3° 40' reached the centre in 3° 40'; a second in 9°; a third had moved someway only part of the way towards the centre in the nine hours; the fourth in 24° had moved a only short distance: not one of the four three bits of cinder which had reached the centre were after 24° well enclosed; in fact only two or three hairs glands on each leaf besides that which carried the atoms, had enclosed come in contact with it. (D.) Much which had been placed on marginal hairs   all  Whereas in of the case of the seven flies all carried never quickly to the centre were well enclosed   by nearly all the hairs on said leaf   in form four to ten hours, after being having been first placed on the glands, of marginal hairs. These facts

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