. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 82 C. L. HOOD. collection was set aside and remained untouched until August I. On this date the zoochlorellae in twelve specimens examined were innumerable (Fig. 3). On June 8, 1926, eight cultures, containing twelve specimens per culture, of Frontonia harboring relatively few zoochlorellae, were started in fresh water to which a small amount of detritis. FIG. 3. Showing increase of zoochlorellae in Frontonia after the same collection (Fig. 2) had remained in the laboratory for thirty days. from the collecting dish was added
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 82 C. L. HOOD. collection was set aside and remained untouched until August I. On this date the zoochlorellae in twelve specimens examined were innumerable (Fig. 3). On June 8, 1926, eight cultures, containing twelve specimens per culture, of Frontonia harboring relatively few zoochlorellae, were started in fresh water to which a small amount of detritis. FIG. 3. Showing increase of zoochlorellae in Frontonia after the same collection (Fig. 2) had remained in the laboratory for thirty days. from the collecting dish was added. These cultures remained in the laboratory with abundant light, but never in direct sunlight, until July 8, without adding more fresh spring water. At this time slides were made from each culture. The zoochlorellae in 95 per cent, of the animals were innumerable. Checks which corroborate these findings were made with cultures started June 10 and 12. From these results the conclusion, that the number of zoo- chlorellae in Frontonia leucas may be increased by an increase in stagnation and putrefaction of the medium in which they live, seems logical. INFLUENCE OF OSMOTIC PRESSURE. In an effort to explain, beyond the simple statement of the difference between stagnant and fresh water, these variations in the number of zoochlorellae inhabiting each host, cultures with various osmotic pressures were made as follows: Three cultures using distilled water, three cultures using fresh spring water, three cultures of one per cent, dextrose in spring water. Into each of these cultures were placed six specimens in which the zoochlorellae were numerous, and six with no zoochlorellae. It was found that upon being put into distilled water the organisms with zoochlorellae promptly disintegrated. Ejection of zoo-. 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 pe
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
