PERFECT SOCIETIES OF INSECTS. 197 
the shade at 23°. Having selected a well-peopled hive, 
the inhabitants of which appeared full of life and suffi- 
ciently active in the interior, and luted it all around, ex- 
cept the aperture to the platform on which it stood, he 
stuck in the top a piece of iron wire which terminated in 
a hook, to which he fastened a hair with a small square 
of very thin paper at the other end; this was exactly op- 
posite to the aperture, at the distance of about an inch 
from it. As soon as the apparatus was fixed, the hair 
with its paper pendulum began to oscillate more or less, 
the greatest oscillations on both sides being an inch, by 
admeasurement, from the perpendicular: if the paper 
was moved by force to a greater distance, the vibrations 
did not take place, and the apparatus remained at rest. 
He then made an opening in the top of the hive, and 
poured in some liquid honey: soon after there arose a 
hum, the movement in the interior increased, and some 
bees came out. The oscillations of the pendulum upon 
this became more frequent and intense, and extended to 
fifteen lines or an inch and a quarter from the perpendi- 
‘cular ; but when the paper was removed to a greater di- 
stance from the aperture, it remained at rest. 
Huber, at the proposal of M. de Saussure, in order | 
to ascertain whether artificial ventilators would produce 
an analogous effect, got a mechanical friend to construct 
for him a little mill with eighteen sails cf tin. He also 
prepared a large cylindrical, vase, into which he could, 
at an aperture in the box upon which it was fixed, in- 
troduce a lighted taper. In one side of this box was an- 
other aperture to represent that of a hive, but larger. 
The ventilator was placed below, and luted at the points 
a a{ sae ¥ > 
of contact, and anemometers were suspended before. the 
