. Foundations of Botany. Botany. TYPES OF CRYPTOGAMS; THALLOPHYTES 237 of a central column. Have any of the branches free tips ? With a power of 250 or more examine the spores. A much higher power may be used to advantage. Describe the surface of the spore. THE STUDlr OF BACTERIA 263. Occurrence. — " Bacteria may occur anywhere but not every- ; In water, air, soil, and almost any organic substance, living. Fig. 173. — Spore-Cases of Slime Moulds. A, a group of spore-cases of Arcyria; B, a spore-case of Trichia, bursting open and exposing its spores to the wind, x 20 ; C, thread
. Foundations of Botany. Botany. TYPES OF CRYPTOGAMS; THALLOPHYTES 237 of a central column. Have any of the branches free tips ? With a power of 250 or more examine the spores. A much higher power may be used to advantage. Describe the surface of the spore. THE STUDlr OF BACTERIA 263. Occurrence. — " Bacteria may occur anywhere but not every- ; In water, air, soil, and almost any organic substance, living. Fig. 173. — Spore-Cases of Slime Moulds. A, a group of spore-cases of Arcyria; B, a spore-case of Trichia, bursting open and exposing its spores to the wind, x 20 ; C, threads of the same, with spores between them, x 250. or dead, some species of plant belonging to the group Bacteria may occur. A small bunch of hay placed in a tumbler of water will, at a suitable temperature, yield an abundant crop in a few days or hours. Raw peas or beans soaked for a week or two in water in a warm place will afford a plentiful supply. 264. Cultures. — Pure cultures of bacteria are commonly made in some preparation of gelatine in sterilized test-tubes. Boiled potatoes serve a good purpose for simple (but usually not pure) cultures. Select a few small roundish potatoes with skins entire and boil in water for a sufficient time to cook them through. Cut them in halves with a knife well scalded or sterilized, , freed from all living. 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 Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn & company
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