It is better not to put surplus honey receptacles on the hive until the honey flow actually begins, as, of course, no work will be done in them until then. Moreover, all the heat is needed in the brood apartment during the early part of the season. The bees might also become discouraged by the large amount of empty space and might not begin work in it at all before swarming. The sections would also be soiled by the bees crawling over them and daubing them with propolis. The bee keeper who is familiar with the honey-producing flora of his locality will note the development of the flower buds of any plant from which he expects a crop and will be able to judge accurately by a glance at the colony when sections are needed. The beginner will do well to consult carefully the list of honey-producing plants given in the chapter on "Bee pasturage," and also endeavor by inquiry in his neighborhood to ascertain what other sources, if any, are within the reach of his bees. The usual time of blooming of all principal honey plants should be noted, and the management to secure populous colonies having been in accordance with the directions given in Chapter VII on "Spring manipulation," the opening of the first blossoms of any one of the important honey yielders should be the signal for placing supers with sections on all hives intended for comb honey production. Should these indications not be sufficient, there is still another which no one could mistake. It is to examine the tops of the brood combs from time to time and note when the store cells between the brood and the top bar are being made deeper by added wax. The fresh, whitened appearance which such combs present when viewed from above readily distinguishes them from the yellow or dark combs wholly built during previous seasons. The lower edges of partially completed combs will also show additions at the same time. [Illustration: Fig. 58.--Dadant-Quinby form of Langstroth hive, elevated from bottom board and slid back for ventilation in summer. (Redrawn from Langstroth.)]