. Bacteriological methods in food and drugs laboratories : with an introduction to micro-analytical methods . Bacteriology; Food; Drugs. 46 BACTERIOLOGICAL METHODS some difficulty is caused by those organisms which happen to be vertically suspended in the counting chamber, thus presenting an end view which gives the appearance of small granules or spherical particles which the comparatively inexperienced observer may not recognize, or which may be mistaken for inorganic particles or organic particles other than microbic. In case of doubt, allow the. Fig. 10.—Tomato pulp cells in normal catsup.
. Bacteriological methods in food and drugs laboratories : with an introduction to micro-analytical methods . Bacteriology; Food; Drugs. 46 BACTERIOLOGICAL METHODS some difficulty is caused by those organisms which happen to be vertically suspended in the counting chamber, thus presenting an end view which gives the appearance of small granules or spherical particles which the comparatively inexperienced observer may not recognize, or which may be mistaken for inorganic particles or organic particles other than microbic. In case of doubt, allow the. Fig. 10.—Tomato pulp cells in normal catsup. The cells are large, thin-walled, containing granular particles. The coloring matter of the tomato frequently ap- pears as deep scarlet-red crystalline particles usually arranged in groups within the cell.—{Howard, Yearbook U. S. Dept. of Agriculture, 1911.) mount to remain at rest for 10 or 15 min., thus allowing the bacilli to settle to the bottom of the cell where they will assume the horizontal position, thus presenting the long axis to view and making counting easier. In order that all of the cells (individuals) of the bacilli may be counted, it is necessary to use a high power (480 to 500 diam.). Lower powers are not satisfactory for counting bacteria. For. 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 Schneider, Albert, 1863-1928. Philadelphia : P. Blakiston's Son & Co.
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