No. 3, DaCBMBBB, 1920] CYTOLOGY 143 



994. ELeqneb, Robert W. The effects of environmental factors upon the heritable char- 

 acteristics of Arcella dentata and A. polypora. Jour. Exp. Zool. 29: 427-441. 7 fig. Nov. 20, 

 1919.— See Bot. Absts. 1, Entry 801. 



995. Jones, D. F. Selective fertilization in pollen mixtures. Proc. Nation. Acad. Sci. 

 U. S. 6- 66-70. / tabic. 1920.— See Bot. Absts. 6, Entry 1700. 



996. Kbbnh, M. Lucille. Studies of zygospore formation in Phycomyces nitens Kunze. 

 Trans. Wisconsin Acad. Sci. 19: 1196-1219. 3 pi. 17 fig. 1919.— See Bot. Absts. 5, Entry 

 1950. 



997. Mangenot, G. Sur revolution du chondriome et des plastes chez les Fucacees. 

 [The evolution of chondriomes and plastids in the Fucaceae.] Compt. Rend. Acid. Sci. Paris 

 170: 200-201. 1 fig. 1920. — Mitochondria and small phaeoplasts are found in all stages of 

 the development of the oogonium and the formation of the oosphere, and also in the fertilized 

 egg and the embryo. It thus appears that the phaeoplasts persist throughout the entire 

 life-cycle in Funis, although in young tissues and reproductive organs they are smaller and 

 more sensitive to reagents. Fucosane is present at all stages except, perhaps, during the early 

 development of the oogonium. — C. H. and W. K. Farr. 



99S. Mascre, M. Sur le role de l'assise nourriciere du pollen. [The role of the tapetum 

 in pollen.] Compt. Rend. Acad. Sci. Paris 168: 1120-1122. 4 fig. 1919.— See Bot. Absts. 5, 

 Entry 1S98. 



999. Mirande, Robert. Sur le carmin alune et son emploi, combine avec celui du vert 

 d'iode, en histologie vegetale. [Carmine-alum and its use as a counter stain with iodine green.] 

 Compt. Rend. Acad. Sci. Paris 170: 197-199. 1920. — The author finds that carmine-alum is 

 not a stain for cellulose but stains pectic bodies. This conclusion is based upon the failure of 

 carmine-alum to stain either cellulose fibers, such as those of cotton, or tissues from the cell- 

 walls from which pectic materials have been extracted. On the other hand it does stain macer- 

 ated portions of carrot or filaments of certain algae, such as Cladophora and the Siphonales. 

 The author also holds that the staining of delignified tissues by iodine-green is to be attrib- 

 uted to the presence of pectic substances. — C. H. and W. K. Farr. 



1000. Moreau, Fernand. Notions de technique microscopique. — Application a l'etude 

 des champignons. [Rudiments of microscopical technique. Its application to the study of 

 fungi.] Bull. Trimest. Soc. Mycol. France 34: 137-191. 35 fig. 1919.— See Bot. Absts. 4, 

 Entry 1131. 



1001. O'Neal, Claude E. Microsporogenesis in Datura Stramonium. Bull. Torrey Bot. 

 Club 47: 231-241. 2 pi. 1920. — In Datura Stramonium, a favorable plant for cytological 

 investigation, the bivalent chromosomes are cut from the spirem thread as loops, which may 

 take on twisted forms, circles, or the U-shape. The bivalents are twelve in number and retain 

 their individuality very strikingly until the telophase of the second division. No physical 

 basis was found for occurrence of mutants nor for the Mendelian characters studied by other 

 workers. — P. A. Mum. 



1002. Parmenter, Charles L. The chromosomes of parthenogenetic frogs. Jour. Gen. 

 Physiol. 2: 205-206. Jan. 20, 1920.— See Bot. Absts. 4, Entry 694. 



1003. Parmenter, Charles L. Chromosome number and pairs in the somatic mitoses of 

 Ambystoma tigrinum. Jour. Morph. 33: 169-249. 9 pi. Dec. 20, 1919.— See Bot, Absts. 4, 

 Entry 093. 



1004. Smith, Bertram G. The individuality of the germ-nuclei during the cleavage of 

 the egg of Cryptobranchus allegheniensis. Biol. Bull. 37: 246-2S6. 9 pi. Oct., 1919.— See 

 Bot. Absts. 4, Entry 771. 



