. Bulletin of the Department of Agriculture. Agriculture. Fig. 15.—Second stage: Dorsal view of an- terior third of a larva dead of sacbrood. (Original.) surface left from the removal of tissues is somewhat roughened, indicating that the removed portion has been taken away piecemeal, and is more or less transverse to the larva. Consistency of the larva in the first stage.—The cuticular portion of the body wall, which chiefly constitutes the sac that characterizes the disease sac- brood, is less easily broken at this time than in the healthy larva. When the body wall is broken the tissues
. Bulletin of the Department of Agriculture. Agriculture. Fig. 15.—Second stage: Dorsal view of an- terior third of a larva dead of sacbrood. (Original.) surface left from the removal of tissues is somewhat roughened, indicating that the removed portion has been taken away piecemeal, and is more or less transverse to the larva. Consistency of the larva in the first stage.—The cuticular portion of the body wall, which chiefly constitutes the sac that characterizes the disease sac- brood, is less easily broken at this time than in the healthy larva. When the body wall is broken the tissues of the larva, which constitute the contents of the sac, flow out. This fluid tissue mass is less milky in appearance than that from a normal larva. The granular character of the con- tents of the sac which is marked in later stages of decay is already in evidence. By microscopic examination the granular appearance is found to be due chiefly to fat cells. Condition of the virus in the first stage.—When larvae of this stage are crushed, suspended in sirup, and fed to healthy bees, a large Fig. 14.—First stage: Portion of a larva dead of sacbrood, showing a more or less transverse roughened surface from which the bees have removed a portion of the larva piecemeal. (Original.). 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Department : Supt. of Docs. , Govt. Print. Off.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
