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might increase and modify 1861 1866 1869 1872
increasing and modifying 1859 1860

an inverted pyramid, 1872
on to a pyramid, formed 1859 1860 1861 1866 1869

natural selection might increase and modify the instinct— always supposing each modification to be of use to the species— until an ant was formed as abjectly dependent on its slaves as is the Formica rufescens.
Cell-making instinct of the Hive-Bee .—
I will not here enter on minute details on this subject, but will merely give an outline of the conclusions at which I have arrived. He must be a dull man who can examine the exquisite structure of a comb, so beautifully adapted to its end, without enthusiastic admiration. We hear from mathematicians that bees have practically solved a recondite problem, and have made their cells of the proper shape to hold the greatest possible amount of honey, with the least possible consumption of precious wax in their construction. It has been remarked that a skilful
workman,
work-man,
workman
with fitting tools and measures, would find it very difficult to make cells of wax of the true form, though this is
perfectly
....
effected by a crowd of bees working in a dark hive.
Grant
Granting
whatever instincts you please,
and
....
it seems at first quite inconceivable how they can make all the necessary angles and planes, or even perceive when they are correctly made. But the difficulty is not nearly so great as it
at
at
first appears: all this beautiful work can be shown, I think, to follow from a few
very
....
simple instincts.
I was led to investigate this subject by Mr.
Water- house,
Waterhouse,
who has shown that the form of the cell stands in close relation to the presence of adjoining cells; and the following view may, perhaps, be considered only as a modification of his theory. Let us look to the great principle of
graduation,
gradation,
and see whether Nature does not reveal to us her method of work. At one end of a short series we have humble-bees, which use their old cocoons to hold honey, sometimes adding to them short tubes of wax, and likewise making separate and very irregular rounded cells of wax. At the other end of the series we have the cells of the hive-bee, placed in a double layer: each cell, as is well known, is an hexagonal prism, with the basal edges of its six sides bevelled so as to
fit
join
an inverted pyramid, of three rhombs. These rhombs have certain angles, and the three which form the pyramidal base of a single cell on one side of the
comb,
comb
enter into the composition of the bases of three adjoining cells on the opposite side. In the series between the extreme perfection of the cells of the hive-bee and the simplicity of those of the
humble-bee,
humble-bexe,
humble-bee
we have the cells of the Mexican Melipona domestica, carefully described and figured by Pierre Huber. The Melipona itself is intermediate in structure between the hive and humble bee, but more nearly related to the
latter:
latter;
it forms a nearly regular waxen comb of cylindrical cells, in which the young