[187]

Echeveria

Same scale

[188]

Echeveria

same scale no lettering

[189]

(Echeveria stolonifera: circumnutation of leaf, traced from 8' 20m on June 25th to 8˚45 a.m. 28th.─

Apex of leaf 12 1/4 inch from glass, so tracing movements much magnified. Temp 23˚- 24 1/4˚C. & therefore very favourable to growth. )

[189v]

92 703

Chap. E 10

=prising circumstance fact that some entomophilous plants should have been after having been once rendered entomophilous, should ever again rendered anemophilous; but this has occurred, as though only in a few cases instances, for instance with the common Poterium sanguisorba, as we may be inferred from its belonging to the Rosaceæ. Such cases are, however, intelligible, as As Almost all plants require to be occasionally intercrossed; & if any entomophilous species which ceased to be visited by insects, it would either probably become extinct or would have unless it were to be rendered anemophilous. A plant would be neglected by insects if nectar failed to be secreted, unless indeed a large supply of attractive pollen was present; and from what we have seen of the excretion of saccharine fluid from leaves and glands being largely governed in several cases by climatic influences, and from some few flowers still retaining coloured guiding-marks, though they do not secrete nectar, the failure of the secretion of nectar cannot be considered as a very improbable event. The same result would follow to a certainty, if winged insects