. Bulletin of the Department of Agriculture. Agriculture. BULLETIN 431, V. S. DEPARTMENT OF AGRICULTURE. As siubriMxl has l)ei'ii proved, however, to be a distinct disease ami (lidcrcMit from all other disorders, iiatm-ally it is mcorrect to use the terms "sacbrood" and "pickled brood" synonymously, either in 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 ii disease, both the description and the recognition of the symptoms of the disease
. Bulletin of the Department of Agriculture. Agriculture. BULLETIN 431, V. S. DEPARTMENT OF AGRICULTURE. As siubriMxl has l)ei'ii proved, however, to be a distinct disease ami (lidcrcMit from all other disorders, iiatm-ally it is mcorrect to use the terms "sacbrood" and "pickled brood" synonymously, either in 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 ii disease, both the description and the recognition of the symptoms of the disease are often materially aided. Before discuss- ing the sjrmptoms of sacbrood, therefore, a description of the healthy brood at the age at which it dies of sac- l)rood will be 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 all cells in the un- capped areas will be without caps while practically all in the capped areas will 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, and a cap. (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, Aj) is formed by two sides which with equal propriety may togethe
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