. Sacbrood. Bees. 28 BULLETIN 431, tr. S. DEPAETMENT OF AGEICULTUEE. nies. WTaen all tMs is properly done, sacbrood will appear in the inoculated colonies. This shows that the virus ^ of this disease, to a. Tig. 26.—Berkefeld filter (B) -with the glass mantle (A), glass tubing (D), a connecting rubber tubing (C), and a flask (F) with a cotton plug (E). (Original.) certain extent, at least, passes through the Berkefeld filter. With this filter the virus is therefore filterable. 1 Inreferrii^ to the inlecttng agent in sacbrood, the term "rirus" is preferable to the terms "germ&quo
. Sacbrood. Bees. 28 BULLETIN 431, tr. S. DEPAETMENT OF AGEICULTUEE. nies. WTaen all tMs is properly done, sacbrood will appear in the inoculated colonies. This shows that the virus ^ of this disease, to a. Tig. 26.—Berkefeld filter (B) -with the glass mantle (A), glass tubing (D), a connecting rubber tubing (C), and a flask (F) with a cotton plug (E). (Original.) certain extent, at least, passes through the Berkefeld filter. With this filter the virus is therefore filterable. 1 Inreferrii^ to the inlecttng agent in sacbrood, the term "rirus" is preferable to the terms "germ" or "; In relation to the disease, however, its meaning is the same as that conveyed by the latter Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original White, G. F. (Gershom Franklin), b. 1875. Washington, Govt. Print. Off.
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