. Carnegie Institution of Washington publication. Fig. 18.* 1904, p. 377, 6 pi.). He found chloride of lithium specially advantageous for provoking these growths, which are re- garded as teratological. He obtained them in 24 hours. GENERAL COMMENT. Great care should be paid to the minute morphology / of each organism, not only in the host-plant but also in a variety of cultures, old and young, so that a body of knowledge more exact than we now possess shall be grad- ually accumulated for differential and systematic purposes. Careful drawings and photographs should be made. The Abbe camera is a
. Carnegie Institution of Washington publication. Fig. 18.* 1904, p. 377, 6 pi.). He found chloride of lithium specially advantageous for provoking these growths, which are re- garded as teratological. He obtained them in 24 hours. GENERAL COMMENT. Great care should be paid to the minute morphology / of each organism, not only in the host-plant but also in a variety of cultures, old and young, so that a body of knowledge more exact than we now possess shall be grad- ually accumulated for differential and systematic purposes. Careful drawings and photographs should be made. The Abbe camera is a great help in making drawings (fig. 121). For such study the Zeiss apochromatic lenses and com- pensating oculars can not be recommended too highly, particularly the 16 mm., with the 12 and 18 compensating oculars for studying the margins of colonies, and the 2 mm. 11. ap., with the 8 and 12 compensating oculars for the more detailed study of the individual rods. The writer has also made much use of the Zeiss 3 mm. n. ap. apochro- matic objective. The Zeiss screw, or filar, micrometer com- bined with a No. 12 compensating ocular (fig. 23) will be found very useful. For photographic purposes the projec- tion oculars or the 4 or 6 compensating oculars may be used. Robert Koch was entirely correct in saying: "A general use of photography in microscopic works would certainly have prevented a great number of unripe ;. Fig. *Fic. 18.—Bacterium camfcstre. Cover-glass (smear) preparation from the vessels of a cab- bage plant received from Racine, Wis., Sept. 19, 1896. Stained with carbol-fuchsin. Drawn from a photomicrograph. X 1,000 circa. tFic. 19.—Bacterium camfestre from an old culture on 23 per cent grape-sugar agar, showing long filaments. Cover stained I hour and 20 minutes in gentian violet (i part saturated alcoholic solution plus I part water). Many of the rods stained feebly. Tube inoculated June 30, 1898. Cover prepared Aug. 8. Dra
Size: 989px × 2527px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1905
