Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ...composed of rounded, pyriform, or spindleshaped cells which contain numerous bright yellowish-green globules, which are larger, and perhaps more abundant, than those of the preceding species. The cells taken as a whole are narrower than those of TV. Mesnili. Their flagella, directed centrally, are more delicate and hence more difficult to see in the living preparation than are those of the preceding type (Fig. 3, Plate 7). The free forms, while common enough, are much less motile than is the case with either of the preceding. It may often happen that in a preparation not more than a dozen cells can be found to travel about actively. When moving about they roll on their long axis, whip forward. Usually they attach themselves by their whips to the glass and show a slow swaying motion. The absence of marked motion is apparently due to a stickiness of the exterior of the free cell. This is seen in the fact that a red blood corpuscle often adheres to the middle portion of the cell when touched by the latter. It is further indicated by the marked tendency to form agglutination groups, which are somewhat suggestive of those of TV. Brucei. The two cells may adhere laterally, with the whips at opposite ends, and the group thus started may increase in numbers so that eventually several hundred cells may be together. In such groups the whips are on the outside and in active motion. The cells usually contain from 5-10 large globules which are found in the posterior end though not always. Rounded, rolling forms about the size of a red blood corpuscle (Fig. 6, Plate 7) are common in the early cultures and represen dividing forms. In old cultures, the rounding up, as with other trypanosomes, is a common involution change. The stained preparations show a coarsely granular ...
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