. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . Fig. 55.—Vibriones tritici X about 40. The acants farina is a small microscopic parasitewhich infests the grain, and closely resembles the acarusscabiei. It especially affects damp and inferior flour;. Fig. 56.—The wheat mite (Acarus farin^e). (x 85). its characters are shown in figure 56. The eggs of theparasite are oval. The various fongi which attack corn, are the follow-ing:— I. Oidium ahortifaciens, or ergot, most frequentl
. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . Fig. 55.—Vibriones tritici X about 40. The acants farina is a small microscopic parasitewhich infests the grain, and closely resembles the acarusscabiei. It especially affects damp and inferior flour;. Fig. 56.—The wheat mite (Acarus farin^e). (x 85). its characters are shown in figure 56. The eggs of theparasite are oval. The various fongi which attack corn, are the follow-ing:— I. Oidium ahortifaciens, or ergot, most frequentlyattacks rye (ergot of rye ), and causes when preva-lent in the corn, a condition known as ergotismamong many of those who habitually consume rye X2 308 LABORATORY WORK. bread and biscuits. Those seeds which are not abso-lutely replaced by the fungus are discoloured brown,as is also the flour—which generally has a peculiar sourodour. A microscopic examination shows the charac-teristic appearances seen in figure 57. Chemically, its presence in flour is detected by oneof three methods :— {a) The flour is made into a paste with a weak solu-tion of liquor potassae, and then dilute nitric acidis added to shght excess. When the whole issubsequently neutralised by a little more of the
Size: 1508px × 1657px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphiladelphiablakis
