Perfect protection from wet and the vicissitudes of temperature, is partly ensured by the external bee-box being made of well-seasoned wood; poplar is recommended as of a looser grain than fir, deal, &c., and consequently, not so great a conductor of heat; but the objection to wooden bee-hives or boxes, for being more easily affected by the variations of the temperature, is removed by the construction of the "bar frame-hive;" for the bee-frames form, as it were, a smaller box within the oblong box, and are not in immediate contact with the external air, but have a half inch space nearly all round them, which will to a certain extent maintain an equable temperature for the bees, both in summer and winter. Any moisture condensed from the heated air generated by the bees, is carried off through the perforated sheets of zinc above the frames, and cool store-room for the honey is also thus secured. A feeding trough is made on the principle of a bird-glass: with a tin feeder and a small bottle for the liquid food to be put into. [Illustration: _Fig. IV._] The tin feeder is six inches by 7-1/2 long, and one inch deep, and just fits on to the top of the bee-frames, where the perforated sheets of zinc are laid; within this feeder a half inch opening is cut at the bottom, fig 4, _a_, and an inclined plane _b_, reaching half way up the depth of the trough; and a sheet of perforated tin, _c_ (placed horizontally from point _b_,) through which the bees suck the food, which is kept at the same level by atmospheric pressure; for as the food is drawn down below the mouth of the bottle, _d_, air forces itself into the bottle, and the same quantity of food trickles down into the feeder, a piece of glass, _e_, exactly the same size as the feeder, is placed over it, through which the bees may be seen whilst feeding, and the feeding trough will be nearly of the same temperature as the interior of the box or hive, and prevent the bees being chilled, as they would be in winter, if compelled to descend for their food; and besides, the bees are less likely to be attacked by wasps or strange bees when fed from above, as the intruders would have to ascend through the mass of bees in the box, which would be attended with danger to them. The bees can be fed when necessary by one of the sheets of perforated zinc being drawn on one side, and the feeding trough, with the bottle of food in it, being placed over the opening; when the bees will ascend through the half inch space at _a_, and feed themselves with the liquid, or carry it away and store it up for future use. HIVES AND BEE-BOXES. Having given a description of the bar-frame-hive, it will be as well to enter into the comparative advantages of using wooden boxes and straw hives.