Journal of Applied Microscopy. 371 



How is the structure of the new organs modified ? 



To what degree do they acquire the structure of the organs which they 

 replace ? 



He then gives the result of a number of careful experiments on roots of 

 replacement, showing that the lateral or branch root, which replaces a tap root, 

 not only resembles it in external appearance, but in anatomical structure as 

 well. A second series of experiments brings out the same facts in the case of 

 lateral branches which replace main stems. In another division of his paper he 

 discusses the changes which take place in stems when deprived of leaves at an 

 early stage. Such stems, when compared with normal stems, show considerable 

 modifications of structure, perhaps the most striking of which are the greater 

 development of chlorophyll-bearing tissue and the multiplication of stomata. 

 These latter facts are emphasized by some physiological experiments which show 

 a much greater power for transpiration and fixation of carbon in stems, which 

 have been deprived of leaves, than in normal stems. A. C. Moore. 



Chicago. 



Goldberger, B. A. A Ready Supply of Vaucheria. The writer has been able to obtain 



Bot. Gaz. 27: May, i8og. , i r r -i- tz 7 ■ ^ 



■' ^^ a good supply of fruitmg Vaucheria at 



any time of the year by carefully removing the mats from pots in greenhouses, 



and throwing them into a jar half full of water. The jar should be placed in 



good sunlight. In five or six weeks the material may show both methods of 



reproduction, and has the advantage of being free from dirt and other algae. 



The species experimented upon was Vaucheria sessilis. c. j. c. 



Williams, J. L. New Fucus Hybrids. Ann. Several years ago Thuret obtained hy- 

 Bot. 13: 187-188, 1899. . . . ? 



brids by fertilizing oospheres of Fucus 



vesiculosus with antherozoids of F. serratns. The present short note records 

 some interesting experiments. Oospheres of F. vesiculosus fertilized by anthero- 

 zoids of Ascophyilmn in many cases developed into healthy plants. When 

 antherozoids of i . serratus were added to eggs of Ascophyllum^ about one-fourth 

 the number produced investing walls, and a few segmented but failed to develop 

 further. Antherozoids of Halidrys added to eggs of F. vesiculosus gave no evi- 

 dence of fertilization. c, j. c. 



RECENT LITERATURE. 



Caldwell, 0. W. The Relation of Bacteria to Murray, Q. and Blackman, V. H. On the nature 



the Nutrition of Plants. The American of the Coccospheres and Habdospheres. 



Florist. 14: 1173-1175, 1898. Phil. Trans, of the Royal Soc. of London. 



Davis, B. M. Recent Work on the Life- Ser. B. 190: 427-441, pl- 15-16, 1898. 



History of the Rhodophycea;. Bot. Gaz. Nemec, B. Ueber die Karyokinetische Kern- 



27: 315-320, 1899. theilung in der Wurzelspitze von Allium 



Giesenhagen, K. Lehrbuch der Botanik. ^</^«- Jahrb. f. wiss. Bot. 33: 313-336, pl. 3, 



Second edition. Pp. IX + 406, ff. 528. 1899. 



Miinchen & Leipzig. Dr. E. Wolff, Wissen- Salmon, E. S. On the Genus Fissidens. Ann. 



schaftlicher Verlag, 1899. Bot. 13: 103-130, pl. 5-7, 1899. 



Lang, W. H. On Apogamy and the Develop- Sturch, H. H. Harveyella Mirabilis. Ann. 



ment of Sporangia upon Fern Prothallia. Bot., 13: 83-102, pl. 3-4, 1899. 



Phil. Trans, of the Royal Soc. of London. Trow, A. H. Observations on the Biology and 



Series B. 190: 187-238, pl. 7-1 1, i8c^8. Cytology of a New Variety of Achlya 



Mac Dougal, D. T. Symbiotic Saprophytism. Americana. Ann. Bot. 13: 131-179, pl. 8- 



Ann. Bot. 13: 1-47, pl. 1-2, 1899. 10, 1899. 



