. The biology of the protozoa. Protozoa; Protozoa. 262 BIOLOOY OF THE PROTOZOA region. Except for mutilations these regenerations and replace- ments occur only at periods antecedent to cell division and indicate some far-reaching change in the constitution of the protoplasmic make up. The ability to undergo such a change furthermore is progressive as shown by experiments in cutting Uronychia (Calkins,. Fig. 135.— Uronychia transfuga, merotomy and regeneration. 1, cells immediately after division, cut as indicated; 2, fragment A of 1, three days after the operation, no regeneration; 3, cell cut
. The biology of the protozoa. Protozoa; Protozoa. 262 BIOLOOY OF THE PROTOZOA region. Except for mutilations these regenerations and replace- ments occur only at periods antecedent to cell division and indicate some far-reaching change in the constitution of the protoplasmic make up. The ability to undergo such a change furthermore is progressive as shown by experiments in cutting Uronychia (Calkins,. Fig. 135.— Uronychia transfuga, merotomy and regeneration. 1, cells immediately after division, cut as indicated; 2, fragment A of 1, three days after the operation, no regeneration; 3, cell cut five hours after division; 4, fragment A of 3, three days after operation, no regeneration; 5, cell cut at beginning of division as indicated, into fragments A and BC; A',B',C", fragments A, B, and C, twenty-four hours after the operation; fragment A regenerated into a normal but amicronucleate individual A'; B C divided in the original division plane forming a normal individual C, and a minute but normal individual B'. (After Calkins.) 1911). In these experiments the cell if cut immediately after divi- sion in a plane indicated by the section line (Fig. 135) is divided into two fragments, one of which, the posterior with giant cirri, contains the single micronucleus, while the anterior portion, with peristome, contains a part of the macronucleus but no 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 Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, Lea & Febiger
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