72 CYTOLOGY [BoT. Absts., Vol. X, 



a trace. In some of these cases it first fragments, the fragments going to the poles and be- 

 having as huge chromosomes. In the pollen-mother-cells of Mercurialis the chromosomes 

 function in an analogous fashion to these nucleoles. — C. H. Farr. 



451. LiTARDiERE, R. DE. Rcmarquc au sujet de quelques processus chromosomiques dans 

 les noyaux diploidiques du Podophyllum peltatum L. [Remarks on certain chromosome pro- 

 cesses in the diploid nuclei of Podophyllum peltatum.] Compt. Rend. Acad. Sci. Paris 172: 

 1066-1068. 1921. — Alveolization of the daughter chromosomes in the anaphases occurs in 

 this species. Anastomoses between adjacent chromosomes in telophase are not as inter- 

 preted by Overton in 1909 but are formed by the fusion of pseudopodia-like projections from 

 the chromosomes. Twelve chromosomes represent the diploid number as opposed to 16 

 reported by Overton and Mottier in American material. This difference may indicate a 

 varietal difference. — C. H. Farr. 



452. PoLiTis, J. Sur les corpuscules bruns de la brunissure de la vigne. [On the 

 brown corpuscles of brunissure of the grape.] Compt. Rend. Acad. Sci. Paris 172: 870-873. 

 1921. — Among the causes that have been suggested for the burnishiiig of the grape are animal 

 parasites, fungi, myxomycetes, and physiological disturbances. Minute intracellular bod- 

 ies, yellow to brown in color, are found to be present which react to tests for tannin and also 

 appear as mitochondria when treated with the Regaud or the Benda method. — C. H. Farr. 



453. PoLiTis, J. Sur I'origine mitochondriale des pigments anthocyaniques dans les fruits 

 [On the mitochondrial origin of the anthocyan pigments of fruits.] Compt. Rend. Acad. Sci 

 Paris 172: 1061-1063. 1921. — In the epidermis of the fruits of Vitis vinijera, Solarium Melon- 

 gena, and Convallaria japonica the anthocyan is formed from the tannin in the mitochondria. — 

 C. H. Farr. 



454. Potts, F. A. A note on vital staining. Proc. Cambridge Phil. Soc. 20: 231-234 

 1921. 



455. RiKER, A. J. Chondriomes in Chara. Bull. Torrey Bot. Club 48: 141-148. PL 3. 

 1921. — Two species of Chara were studied, and the chromatic granules (prochondriomes) were 

 found to appear on the central plate in anaphase, taking their origin in the nucleolus and mi- 

 grating into the cytoplasm to become chondriomes. Chondriomes can thus arise as nuclear 

 extrusions, but also by fission from other chondriomes. Prochondriome contents seemed not 

 to differ, in the actively growing tip, in purely vegetative cells, and gamete-producing cells; 

 extrusion of prochondriomes "is apparently not connected with nuclear degeneration or dif- 

 ferentiation of the germ and vegetative cells." — P. A. Mum. 



456. RiVETT, M. F. The structure of the cytoplasm in the cells of Aliculariascalaris Card. 

 Ann. Botany 32: 207-214. PL 6, 3 fig. 1918. 



457. Sharp, Lester W. An introduction to cytology, xiii + ^52 p., 159 fig. McGraw- 

 Hill Book Co.: New York, 1921. 



458. Vles, F., et J. Dragoiu. Sur la pression osmotique d'arret de la division cellulaire. 

 [Concerning the effect of osmotic pressure in arresting cell-division.] Compt. Rend. Acad. 

 Sci. Paris 172: 1127-1130. 1921. — The increase in external osmotic pressure, without an 

 appreciable variation in the electrolytic dissociation, retards the segmentation of the sea 

 urchin egg. An increase in osmotic pressure of 1 1 atmospheres stops cytoplasmic division, but 

 not nuclear division, which continues up to 23 atmospheres above normal. The work done in 

 successive divisions of the egg is calculated to be as follows: 1st division, 4.02 ergs; 2nd di- 

 vision, 1.66 ergs; 3rd division, 0.81 ergs; 4th division, 0.28 ergs. — C. H. Farr. 



459. Ward, Cutler D. The cytological problems arising from the study of artificial par- 

 thenogenesis. Part II. Sci. Prog. [London] 16: 71-78. 1921. 



