ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 561 



Lorenz, M.— Ascosomaceae, eine neue Faniilie der Siphoneen aus deni Cambium, 

 von Schantung. ( Ascosomacea&, a new family of the Siplioinse fiom the Cambium 

 of Shantung ) Centralbl. Min. Geol. Faldont. (1904) pp. 193-4. 



Marsh, C. D. — The Plankton of Lake Winnebago and Green Lake. 



Wisconsin Geol. Nat, Hist. Surv. Bull, xii. (1903) pp. 1-9L 

 Monti, E. — Limnologische Untersuchungen iiber einige italienische Alpenseen. 

 (Liuinological investigations of several Italian Alpine lakes.) 



Fonchungsber. Biol. Stat. Flon, xi. (1904) pp. 252-75 (13 text figs.). 



Nitardy, E. — Die Kryptogamenflora des Kreises Elbing. (The cryptogamio flora 

 of the environs of Elbing.) 



[A list containing 111 fresh-water alga? of this Prussian locality.] 



Hcdicigia, xliii. (190*1) pp. 314-42. 



Odin, A. — Le verdissement de l'Huitre. (The green coloration of oysters.) 



Le Feveil Salicole, ostreic. et de pech. marit , iii. (1904) pp. 24-6. 



Ostenfeld, C. H. et Paulsen, O. — Planktonproever fra Nord-Atlanterhave 

 (c. 58°-60° N. Br.) samlede i 1899 af Dr. K. J. V. Steenstrup. (Samples of plank- 

 ton from the N. Atlantic Ocean (about 58°-00° N. Lut.) collected in 1899 by 

 Dr. K. J. V. Steenstrup.) Medd. von Gronland, xxvi. (1904) pp. 143-250. 



Petraschevsky, L. — TJeber Atmungskoeflizienten der einzelligen Alge Chloro- 

 thecium saccharophilum. (On the coedicient of respiration of the unicellular 

 alga Cldowthecium saccharophilum.) Bcr. Deutsch. But. Gesell. (1904) pp. 323-7. 



Protic, G. — Beitrag zur Kenntniss der Flora der Umgebung von Vares in 

 Bosnien. V. (Addition to our knowledge of the flora in the environs of Vares, in 

 Dosnia. V.) 



[Written in Servian.] Glasn. Zemalj. Muz. Bosn. i Ilerceg., xv. (1903) 



pp. 273-318. 

 Keinhard, L— Zur Kenntniss des Phytoplankton von Donjec. (On tiie phyto- 

 plankton of Donjec.) 



[Russian.] Arb. Gesell. Naturf. Charhoio (1904) 28 pp. 



Schmidt, Grvjndler, Grunow, Janiscu & Witt.— Altas der Diatomaceen 

 kunde. (Atlas of diatoms.) Parts 02-63, Leipzig, 1904 



Skorikow, A. S.— Ueber das Sommerplankton der Newa und aus einem Teile des 

 Ladoga-Sees. (On the summer plankton of the Newa and of a part of Ladoga 

 lake.) Biol. Centralbl, xxiv. (1904) pp. 353-60, 385-91. 



Fungi. 



Variations of Growth in Achlya polyandra.* — L. Horn has con- 

 ducted an exhaustive research on this subject, his object being to throw- 

 light on the influence of external conditions, such as culture media, in 

 determining form variations within the species. He obtained the fungus 

 by immersing the bodies of flies, mealworms, etc., in water collected 

 from various suitable sources. From the hyphal growth he isolated 

 a small piece of mycelium and produced a pure culture of the desired 

 plant. Pepton agar and pease water were chiefly used as media, and 

 their influence on the growth of the mycelium was noted. Attention 

 was drawn at an early stage to certain unhealthy appearances which 

 were found to be due to oligo-dynamic influence as described by Nageli ; 

 that is the influence exerted by minute quantities of metals in the water 

 used in the cultures. Niigeli's observations were made on Spirogyra. 

 Horn found that Achlya was equally sensitive. It reacted most 

 quickly to the presence of copper, obtained by placing a penny for 

 a loncrer or shorter time in the solution. A considerable selection of 



* Ann. MycoL, ii. (1904) pp. 207-41 (21 figs.). 



