. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. SECTIONS. 123 moves forward at each stroke a distance governed by the set-screw of the scale (/<3 /' to 40 /<). By snbstitnting a wide knife-carrier, sections several centimeters in diameter may be cnt, and by using a slanting knife, as for celloidin, very hard mate- rial may be cnt. By a set-screw, the razor as here .shown may be turned a few degrees to right or left, and the paraffin block may also be moved through a considerable arc in any direction, it being held securely in any position by pressure of
. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. SECTIONS. 123 moves forward at each stroke a distance governed by the set-screw of the scale (/<3 /' to 40 /<). By snbstitnting a wide knife-carrier, sections several centimeters in diameter may be cnt, and by using a slanting knife, as for celloidin, very hard mate- rial may be cnt. By a set-screw, the razor as here .shown may be turned a few degrees to right or left, and the paraffin block may also be moved through a considerable arc in any direction, it being held securely in any position by pressure of a collar-screw on a ball-and-socket joint. On 72 in plate 13 is an apparatus for trueiirg the edges of the paraffin Fig. 114.* Collections of living bacteria are also necessary. Fortunately many may now be obtained, as needed, from Krai, in Prague; but, unfortunately, they do not always correspond to their name. Others must be kept on hand, and the cultures (of some sorts) must be renewed at frequent inten^als. That way which has given the writer *FiG. 114.—A. Knife for serial sections, furnislied with the Reinhold-'Gihay microtome. This is made by Joseph Rodgers & Son, Sheffield, England. One-half actual size. B. Microtome knife made to order by Charles Lentz & Sons, Philadelphia, and found useful in cutting hard material with long slant strokes. One-half actual size. The broad wedge-shaped blade of this knife is shown in !>. C. Knife obtained from J. R. Torrey & Co., Worcester, Mass , and found very useful for making serial sections on the microtome. One-half actual size. D. Torrey razor, recommended for free-hand sections. The very thin blade is flat on one face and hollow-ground on the other, as shown in d. It is made of the very best steel and holds an edge well. One-half actual size. a, b, c, d, end views of the cutting edge of knives shown in A, B, C, D. Actual Please note that these images are extracted from scanned page images that may
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