[Illustration: Fig. 70.--Beehives with Langdon non-swarmer attached: _A, B_, hives; _S, S′_, supers; _D_, non-swarming device; _e, e′_, entrances corresponding to hive entrances; _sl_, slide for closing entrance; _c, c′_, conical wire-cloth bee-escapes; _ex, ex′_, exits of same. (From Insect Life.)] LANGDON NON-SWARMING DEVICE. This device (fig. 70, _D_), first described and illustrated in Insect Life for April, 1893 (Vol. V, No. 4), is designed to do more than merely prevent swarming. The following claims are made by the inventor: (1) It prevents all swarming without caging queens, cutting out queen cells or manipulation of brood combs. (2) Two light colonies that would not do much in sections if working separately make one good one by running the field force of both into the same set of supers. (3) No bait sections are needed, as the bees can be crowded into the sections without swarming. (4) The honey will be finished in better condition, that is, with less travel stain, because the union of the field forces enables them to complete the work in less time. (5) There will be fewer unfinished sections at the close of the honey harvest for the reason just mentioned. (6) Also for the same reason honey can be taken off by the full case instead of by the section or holderful. (7) Drones will be fewer in number, as a double handful will often be killed off in the closed hive while the other is storing honey rapidly. (8) Artificial swarms and nuclei can be more easily made, as combs of brood and bees can be taken from the closed hive in which the queen can be found very quickly. (9) It enables one to care for more than twice as many colonies as under the swarming system. Results according with the claims mentioned above have been reported from various localities, but numerous adverse reports have also been given, the latter indicating clearly that some modification of the device is necessary if it is to be made generally serviceable. A further trial of the principle under varying conditions and climates will also be required to decide its exact value. The manner of using the device is simple. Before the colonies swarm the device is attached to the fronts of two adjacent hives. The slide (fig. 70, _sl_) having been inserted at one end of the device, the bees returning from the fields are all run into the other hive, on which the supers are then placed. Before the colony, thus made doubly populous, decides to swarm, the slide and supers are both changed to the other hive. This is repeated every four or five days during the swarming period. SELECTION IN BREEDING.