. Diseases of bees. Bees. 6 BULLETIN 431, TJ. S. DEPAETMENT OF AGKICULTtJBE. As sacbrood has been proved, ho\\-(:'ver, to be a disUiift disease and different from all other disorders, iiaturaUy it js incorrect to use the terms "sacbrood" and "pickled brood" synonymously, either m the popular or in the technical sense.^ APPEARANCE OF HEALTHY BROOD AT THE AGE AT WHICH IT DIES OF SACBROOD. By comparing the appearance of healthy brood with that of brood dead of a disease, both the description and the recognition of the symptoms of the disease are often materially aided. Before
. Diseases of bees. Bees. 6 BULLETIN 431, TJ. S. DEPAETMENT OF AGKICULTtJBE. As sacbrood has been proved, ho\\-(:'ver, to be a disUiift disease and different from all other disorders, iiaturaUy it js incorrect to use the terms "sacbrood" and "pickled brood" synonymously, either m the popular or in the technical sense.^ APPEARANCE OF HEALTHY BROOD AT THE AGE AT WHICH IT DIES OF SACBROOD. By comparing the appearance of healthy brood with that of brood dead of a disease, both the description and the recognition of the symptoms of the disease are often materially aided. Before discuss- ing the symptoms of sacbrood, therefore, a description of the healthy brood at the age at which it dies of sac- brood wiUbe given. In this description the same method will be used and simi- lar terms employed as will be found in the description of the symptoms of the disease. It will be recalled by those who are at all familiar with healthy comb in which brood is being reared that the brood is arranged in such a way that capped and uncapped areas occur alter- nately and in more or less semicircular fashion. Practically aU cells in the un- capped areas will be without caps while practically all in the capped areas wiU be capped. Since the brood that dies of sac- brood, with but few exceptions, does so in capped cells, a description of such brood involves the form, size, and position of these cells. A cell (figs. 1 and 2) may be described as having six side walls, a bottom or base, andacap. (The cap has been removed by the bees from the cells from which these figures were drawn.) In general the six side walls are rectangular and equal. These walls form six equal obtuse angles within the cell (fig. 1). The angle which is uppermost in the cell (Ai) is formed by two sides which together may be termed the roof of the cell. The angle which is lowermost (figs. 1 and 2, A^) is formed by two sides which with equal propriety may together be termed the floor of the cell (fig. 2, F
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