Thus prepared, he must return the box to its proper situation, and then withdraw the sliding tin that hitherto has cut it off from the middle box; by so doing, the store-room is again enlarged. The bees will commence operations in this new apartment. This simple operation, performed at the proper time, generally prevents swarming; by it the queen gains a vast addition to her dominions, and, consequently, increasing space for the multiplying population of her domicile. Provided the weather continue fine, and the thermometer has risen to ninety-five degrees, as marked on the scale, the remaining tin may be also withdrawn, thereby giving the bees admittance to another box. There is now no lack of store-rooms or of employment for our indefatigable labourers. The cylinder thermometer is required to be occasionally dropped into the ventilating tube of the side boxes to ascertain their temperature; for, if exceeding or approaching that of the middle box, it must be reduced by ventilating: this is done by raising the zinc tops, to allow the air to pass through the perforations. The grand object of this system is to keep the end boxes and the bell-glass cooler than the pavilion or middle box, so as to induce the queen to propagate her species there and there only, and not in the depriving part of the hive; by this means the side and upper combs are in no way discoloured by brood. The queen requires a considerable degree of warmth; the middle box does not require more ventilation than the additional openings afford. The bees enjoy coolness in the side boxes, and thereby the whiteness and purity of the luscious store are increased."