Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: 115. Waller, A. E. Xenla. School Sci. Math. 19: 150-157. Feb., 1919.Historical and popular account of xenia, from both a genetic and cytological standpoint. Several illustrations of xenia given, and simple demonstration experiments with maize characters, of instructional value, suggested. See ako Bot. Absts. 5. Entry 496.]Orland E. lul–. CYTOLOGY Gilbert M. Smith, Editor Georqb S. Bryan, Assistant Editor 116. Bobilioff, V. De inwendige bouw der schorselementen ven Hevea brasiliensls. i The structure of cell elements In the bark of Hevea brasiliensls.] Arch. Rubbercult. Neder- landsch-Indie 3: 222-231. 1919.See Bot. Absts. 5, Entry 546. 117. Carter, Nellie. The cytology of the Cladophoraceae. Ann. Botany 33: 467-478. 1 pi., S fig. 1919.The chloroplast in Cladophora, Chaetomorpha and Rhizoclonium consists of a parietal film lining the cell wall and often more or less reticulated. Pyrenoids are very numerous and scattered in both the peripheral and internal parts of the chloroplast. The nuclei are confined almost invariably to the chloroplast, not being found as a general rule in the colorless cytoplasm. During mitosis the nucleus of Rhizoclonium and Cladophora is characterized by the formation of a long thin spireme, which gives rise to very numerous chromosomes. After the migration of the chromosomes to the opposite poles of the spindle the daughter nuclei are separated by constriction of the spindle in the region of the equator.G. S. Bryan. 118. Carter, Nellie. On the cytology of two species of Characiopsls. New Phytol. 18:177-186. S fig. 1919.Characiopsis saccata n. sp. and Ch. Naegelii (A. Br.) Lemm. are treated. The cytological features of the vegetative cells were found to differ in important respects in the two species. Zoogonidangia were not found. …@E°£×=q ¾Û€