310 SUMMARY OF CURRENT RESEARCHES RELATING TO 



-cell, and paid special attention to the time of its appearance, the period 

 •of maximum accumulation, aud the time of its disappearance. Glycogen 

 was found in the young buds of the yeast-cell. It increased in quantity 

 till the end of fermentation, when its maximum was attained, and from 

 this time gradually diminished. Even in hungering lees are always 

 found a number of cells, more or less rich in a glycogen. From these 

 observations the author concludes that the formation and consumption 

 of glycogen in yeast take place simultaneously. It is a transitory 

 reserve (substance, and the yeast is able to make use of it owing to 

 diastatic non-diffusible ferments. 



Oidium lactis. * — M. Guilliermond describes in detail the mould 

 which appears on Neuchatel cheese, when fermented in the open air, and 

 which he identifies provisionally with Oidium lactis. It produces in 

 cultivation (Pasteur's fluid) both mycelial and yeast forms ; but no 

 ascigerous form was obtained. It inverts saccharose, but does not 

 develope in lactose. All attempts to induce alcoholic fermentation 

 failed. The cells contain a readily stainable nucleus. 



Culture of Uredinese.f — The latest instalment of H. Klebahn's con- 

 tributions to this subject deals with a very large number of culture ex- 

 periments made with a view of determining the life-history of the 

 hetercecious fungi belonging to this family. Among the special subjects 

 of investigation are the Melampsorve of the willows, which have their 

 cseoma-forrn on species of Bibes ; Melampsora Allii-fragilis sp. n. ; the 

 Melampsora on Salix alba ; the Melampsorse of the poplars ; the species 

 of Puccinia of the group of P. Bibesii-Caricis ; the species of Puccinia 

 on Phalaris arundinacea, &c. 



Decomposition of Glueosides by Mould-Fungi.} — A. Brunstein has 

 carried out a series of experiments on the decomposition of different glueo- 

 sides by species of Aspergillus, Penicillium, and other fungi, the results 

 being compared in a number of tables. These show that the glueo- 

 sides employed have very different values for the nutrition of the 

 fungi. None of tbem, however, show such good results as Raulin's fluid ; 

 some of them producing substances which are prejudicial to the growth 

 of the organism. In all cases the glucoside is first split up into glucose 

 and a benzol derivative. 



Myceles in Pharmaceutical Solutions.§ — According to F. Gueguen, 

 the mycele so frequently found in pharmaceutical solutions, on which 

 Agardh's genus Rygrocrosis was founded, belongs almost invariably to 

 Penicillium glaucum, in which he includes P. digitatum and P. griseum. 

 The nature of the solution brings about great diversities in the cell- 

 structure of the mycele, the production of conids, &c. 



Sugar-Cane Diseases. — Sir W. T. Thiselton-Dyer || reviews the 

 results at present obtained respecting two diseases which affect the 

 sugarcane in the West Indies: the rind-disease and the root-disease. 



* Rev. Gen. <le Bot. (Bonnier), xii. (1900) pp. 465-79 (11 figs.). 



t Pringsheim's Jahrb. f. wiss. Bot., xxxv. (1900) pp. G60-710. Cf. this Journal, 

 1900, p. 494 (7 figs.). J Beih. z. Bot. Centralbl., x. (1901) pp 1-50 



§ Bull. Soo. Mycol. France, 1898, p. 201 ; 1899, p. 15 (5 pis.). See Bot. Cen- 

 tralbl., lxxxv. (1901) p. 114. || Ann. of Bot., xiv. (1900) pp. 609-16 



