. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. STUDY OF COLONIES. 27 GROWTH. The manner of growth and rapidit)- of growth at given temperatures in hanging drops and also on the margin of )-oung colonies on plates of nutrient gelatin and agar of varying densit)' should be determined. Frequently characteristic and interesting ar- rangements of the rods forming the surface la\'ers of the colony, especially when it is young, may be discovered by means of a direct inspection of the colonies under low ]iowers of the microscope or by means of cover-glass impressions. Covers a
. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. STUDY OF COLONIES. 27 GROWTH. The manner of growth and rapidit)- of growth at given temperatures in hanging drops and also on the margin of )-oung colonies on plates of nutrient gelatin and agar of varying densit)' should be determined. Frequently characteristic and interesting ar- rangements of the rods forming the surface la\'ers of the colony, especially when it is young, may be discovered by means of a direct inspection of the colonies under low ]iowers of the microscope or by means of cover-glass impressions. Covers are carefully placed on the colony, removed, dried, flamed, and stained. There are also often curious Fig- 25.* arrangements of the deeper laj'crs of the surface colony. In direct examination the colonies should be \-iewed by reflected as well as by trans- mitted light. Drawings or photographs of surface colonies should be made under low or medium magnifications. By a little practice using Lister's dilution method ('78, Bibliog., XVII), hanging- drops containing a single bacterium for stud)- under the microscope may be obtained with Beyerinck's capillary drop-flask ('91, Biljliog., XVII). 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 Smith, Erwin F. (Erwin Frink), 1854-1927. Washington, D. C. , Carnegie Institution of Washington
Size: 1864px × 1340px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherwashingtondccarneg
