Abstract
Colonies of the University apiaries were divided into three groups of about equal strength. The colonies in one group were not packed, in another a light packing was applied, and those of the third group were heavily packed. Ample stores were left for wintering. The average mortality for the period of 1943-1944 to 1953-1954 was 18.4%, 6.4%. and 2.9% for the non-packed, lightly packed and heavily packed groups, respectively. When the weak and queen less colonies were also counted, the losses were 34.3%, 15.2% and 10.5% for the above mentioned groups, respectively. The heavily packed group had, on an average, 25.0% and the lightly packed 19.2% more frames of brood in the spring than did the non-packed group.
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