| → were to work 1866 1869 1872 |
| work 1859 1860 1861 |
|
| ↑ 1 blocks not present in 1866 1869 1872; present in 1859 1860 1861 |
| It is even conceivable that an insect might, by fixing on a point at which to commence a cell, and then moving outside, first to one point, and then to five other points, at the proper relative distances from the central point and from each other, strike the planes of intersection, and so make an isolated hexagon: but I am not aware that any such case has been observed; nor would any good be derived from a single hexagon being built, as in its construction more materials would be required than for a cylinder.
|
|
|
to stand at their proper relative distances from each other and from the walls of the last completed cells, and then, by striking imaginary spheres, they can build up a wall intermediate between two adjoining spheres; but, as far as I have seen, they never gnaw away and finish off the angles of a cell till a large part both of that cell and of the adjoining cells has been built. This capacity in bees of laying down under certain circumstances a rough wall in its proper place between two
cells, is important, as it bears on a fact, which seems at first
subversive of the foregoing theory; namely, that the cells on the extreme margin of
are sometimes strictly hexagonal; but I have not space here to enter on this subject. Nor does there seem to me any great difficulty in a single insect (as in the case of a queen-wasp) making hexagonal cells, if she
→were to work
alternately on the inside and outside of two or three cells commenced at the same time, always standing at the proper relative distance from the parts of the cells just
sweeping spheres or cylinders, and building up intermediate planes. ↑
|
|
| As natural selection acts only by the accumulation of slight modifications of structure or instinct, each profitable to the individual under its conditions of life, it may reasonably be asked, how a long and graduated succession of modified architectural instincts, all tending
the present perfect plan of construction, could have profited the progenitors of the hive-bee? I think the answer is not difficult:
cells constructed like those of the bee or the wasp gain in strength, and save much in labour and space, and
in the materials of which they are constructed. With respect to the formation of wax, it is known that bees are often hard pressed to get sufficient nectar, and I am informed by Mr. Tegetmeier
|
