. Protozoo?logy. Protozoa; Protozoa, Pathogenic. Endogamy in Plasmodiophora brassicse. (After Provrazek.) A, portion of plastuodium showing ordinary vegetative nuclei; B, reconstruction of the gametic nuclei; C, cli\^sion of same; D, union of gametes formed about gametic nuclei; E,F, stages in fusion of nuclei and formation of the spore. In basidiobolus, an intestinal fungoid parasite of the turtle, the organism forms straight or branched h}"pha? composed of sister cells Iving end to end, and at maturity two adjacent sister cells conjugate, a process recalling conjugation among the lower
. Protozoo?logy. Protozoa; Protozoa, Pathogenic. Endogamy in Plasmodiophora brassicse. (After Provrazek.) A, portion of plastuodium showing ordinary vegetative nuclei; B, reconstruction of the gametic nuclei; C, cli\^sion of same; D, union of gametes formed about gametic nuclei; E,F, stages in fusion of nuclei and formation of the spore. In basidiobolus, an intestinal fungoid parasite of the turtle, the organism forms straight or branched h}"pha? composed of sister cells Iving end to end, and at maturity two adjacent sister cells conjugate, a process recalling conjugation among the lower plants (conjugate, diatoms, etc.). In actinospherium the phenomena of fertilization are much more complex and have been made the subject of careful study In- Hertwig ('98). The first evidence of the process is the encystment of the adult organism and excretion of waste matters contained in the protoplasm. The many nuclei of the ordinary forms are here reduced to about 5 per cent, of the total by a process of fusion and absorption in the protoplasm, and after this has occurred the mother animal fragments into as many daughter cysts (^cytospores Xo. I) as there are. 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. New York and Philadelphia, Lea & Febiger
Size: 1815px × 1377px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkandphiladel
