142 CYTOLOGY [Bot. Absts., Vol. VI, 



Scolopendrium vulgare, and Asplenium Ruta-muraria are found lenticular and rod-shaped 

 chloroplasts, chondriocontes and granular mitochondria. In the spore mother-cells the 

 chloroplasts undergo transformation into chondriocontes which stain more deeply in later 

 stages. Chondriomites are also present at this stage. The chondriocontes dissociate into 

 mitochondrial granules before the reduction division begins, which persist throughout these 

 divisions as granular chondriosomes. In the spore they give rise to chloroplasts and mito- 

 chondrial bodies of various forms. There thus occurs during spore-formation a mitochondrial 

 reversibility. — C. H. and W. K. Farr. 



986. Evans, Arthur T. Embryo sac and embryo of Pentstemon secundiflorus. Bot. 

 Gaz. 67: 427-437. 1 pi. 1919.— See Bot. Absts. 4, Entry 996. 



987. Falqui, G. II processo di fecondazione nella Thelisia planifolia (Mill) Mattei. [Fer- 

 tilization in Thelisia planifolia (Mill) Mattei.] Nuovo Gior. Bot. Italiano 26: 221-234. 1919. 

 — Observations show that Thelisia planifolia is malacophilous and reproduces asexually by 

 means of bubils, which germinate in the fall and give rise to new plants. — Ernst Artschwager. 



988. Foster, Nathan. Colloids and living phenomena. Sci. Monthly 9: 465-473. 9 fig. 

 1919.— See Bot. Absts. 4, Entry 1396. 



989. Gabd, Mederic. Division chez Euglena limosa Gard. [The cell-division of Euglena 

 limosa Gard.] Compt. Rend. Acad. Sci. Paris 170: 291-292. 1920. Cytokinesis in this spe- 

 cies is by internal cell-division rather than by a simple longitudinal splitting. The 4, 8, 16 

 or even 32 daughter cells remain as irregular masses within the membrane of the old mother 

 cell. They may be arranged in either one or two planes, and each contain a nucleus, a primi- 

 tive chloroplast, some pyrenoids, and much starch. — C. H. and W. K. Farr. 



990. Graham, Margaret. Centrosomes in fertilization stages of Preissia quadrata 

 (Scop.) Nees. Ann. Botany 32: 415-420. PI. 10. 1918.— See Bot. Absts. 4, Entry 1037. 



991. Guilliermond, A. Sur les elements figures du cytoplasme. [The structural ele- 

 ments of the cytoplasm.] Compt. Rend. Acad. Sci. Paris 170: 612-615. 5 fig. 1920. Bodies 

 of mitochondrial form are described in the leaves of Iris germanica. These bodies swell, 

 anastomose and form a network which finally becomes transformed into vacuoles. The author 

 disagrees with Dangeard, contending that these bodies are not metachromatic in nature 

 and that they differ in their development and in their microchemical reactions from the chon- 

 driosomes of animals. However, there are two types of mitochondria in Iris germanica; 

 chondriocontes which assimilate starch in young leaves and later form plastids, and mitochon- 

 dria of a non-assimilating nature. Besides these bodies there are small globules, probably 

 lipoid in nature, which have nothing in common with chondriosomes. — C. H. and W. K. 

 Farr. 



992. Guilliermond, A. Sur devolution du chondriome dans la cellule vegetale. [The 

 evolution of the chondriome in the vegetable cell.] Compt. Rend. Acad. Sci. Paris 170: 194- 

 197. 4 fig. 1920. — In the study of the root of pumpkin (Cucurbita pepo) it is found that the 

 chondriocontes produce composite grains of starch. The granular mitochondria in the same 

 cells do not seem to perform this function although they appear to be morphologically and 

 microchemically identical. A similar physiological differentiation occurs in the perianth of 

 the tulip. In the white variety of tulips (Tidipa sp.) the chondriocontes stain more heavily 

 than the granular mitochondria. In the j r ellow varieties the chondriocontes produce 

 xanthophyll.— C. H. and W. K. Farr. 



993. Hegner, Robert W. The relations between nuclear number, chromatin mass, 

 cytoplasmic mass and shell characteristics in four species of the genus Arcella. Jour. Exp. 

 Zool. 30: 1-95. 47 fig. Jan. 5, 1920— See Bot. Absts. 4, Entry 602. 



