. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. Fig. 219.—Method of pouring gelatin into Petri dishes. {After iMhnis.) A suitable size for these, taking outside measurements, is as follows: height to S cm.; diameter of the bottom about 7 cm. The gypsum block is 3 cm. high; the diameter of the lower surface is cm., that of the upper surface cm. To make a gypsum block, 2 parts of powdered gypsum are mixed with % part of water and the mixture poured into a tin mould. The block should be hard, and the mould must not be rubbed
. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. Fig. 219.—Method of pouring gelatin into Petri dishes. {After iMhnis.) A suitable size for these, taking outside measurements, is as follows: height to S cm.; diameter of the bottom about 7 cm. The gypsum block is 3 cm. high; the diameter of the lower surface is cm., that of the upper surface cm. To make a gypsum block, 2 parts of powdered gypsum are mixed with % part of water and the mixture poured into a tin mould. The block should be hard, and the mould must not be rubbed with fat, oil or such material A culture on a gypsum block in such. Fig. 220.—Petri dish. (After Williams in Schneider, Pharmaceutical Bacteriology, P- 59.) a vessel cannot, as a rule, be kept free from bacterial infection, for the cover must not be closed down tightiy, but should allow free access of the air. The dishes with gypsum blocks are sterilized for one to one and a half hours at 110° to ti5°C., the dishes first being wrapped in a crepe napkin or in iilter paper. The gypsum blocks are sterilized in a moist condition before planting the yeast on their upper surface. The gypsum blocks can be used several times. Method of Pouring Plates (Fig. 219).—Place three sterile Petri dishes (Fig. 220). 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 Harshberger, John W. (John William), 1869-1929. Philadelphia : P. Blakiston's Son & Co
Size: 3605px × 693px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1917
