Our first swarms that issue in May, or first of June, seldom use much of the article pure for soldering and plastering; but instead, a composition, the most of which is wax. I have noticed at this season, when old pieces of boards that had been used for hives, were left in the sun, that this old propolis would become soft in the middle of the day. Here I have frequently seen the bees at work, packing it upon their legs; it was detached in small particles, and the process of packing was seen distinctly, as the bee did not fly during the operation, as in the case of packing pollen. It is asserted that when bees need it they always have it, indicating that they can elaborate it like wax. I can see no reason why they do not need it in June as much as August; yet, in the latter month, they use more than a hundred times the quantity. At this time, they manifest no disposition to gather any from the old boards, &c. It would seem they prefer the article new, which they now have in abundance. Boxes filled in June contain but very little, sometimes none. Why not, if they have enough of it? but when filled in August, they always have the corners, and sometimes the top and sides, lined with a good coat. Cracks, large enough for bees to pass through, are sometimes completely filled with it. In this season, a little before sunset of some fair day, I have frequently seen the bees enter the hive with what I supposed to be the pure article on their legs, like pollen, except the surface, which would be smooth and glossy; the color much lighter than when it gets age. I have also seen them through the glass inside, when they seemed unable to dislodge it themselves, like pollen, and were continually running around among those engaged in soldering and plastering; when one required a little, it seized hold of the pellet with its teeth or forceps, and detached a portion. The whole lump will not cleave off at once; but firmly adheres to the leg; from its tenacity, perhaps a string an inch long will be formed in separating, the piece obtained is immediately applied to their work, and the bee is ready to supply another with a portion; it doubtless gets rid of its load in this way; it is difficult to watch it till it is freed from the whole, as it is soon lost among its fellows. Now if this substance is not found in its natural state, how does it happen that they pack it on their legs just as they do when getting it from a board of an old hive, or pollen, when collected? They never take the trouble to pack the wax there, when elaborated. Do not these circumstances strongly favor the idea of its being a vegetable substance? Perhaps the reason of its being collected at this season in greater abundance, may be found in the fact, that the buds of trees and shrubs are now generally formed. Many kinds are protected from rain and frost, by a kind of gum or resinous coating. It may be found in many species of Populus, particularly the balsam poplar, (_Populus Balsamifera_) and the Balm of Gilead, (_Populus Candicans_). By boiling the buds of these trees, an aromatic resin or gum may be obtained, (used sometimes for making salve;) the odor is very similar to that emitted by propolis, when first gathered by the bees, or by heating it afterwards. In the absence of facts, we are apt to substitute theory. This appears to me to be very plausible. Yet I am ready to yield it as soon as facts decide differently. Perhaps not one bee in a thousand is engaged in collecting this substance--there being so few may be one reason why they are not often detected, yet few as they are, a few of us should set about close observation; something certain might decide. Apiarian science is sadly neglected; a large amount of error is mixed up with truth, that patient, scrutinizing investigation must separate.