86 SUMMARY OF CURRENT RESEARCHES RELATING TO 



sideration the influence of different temperatures, and also the influence- 

 of air and humidity. He studied the effect induced by the combined 

 growth of other organisms such as moulds, bacteria, etc., on the life of 

 the yeast, and also on the odour. The results show great variety of 

 effect on the yeast plant. 



In another paper* the same author describes the behaviour of 

 certain yeast races at a low temperature. He notes the effect on the 

 oell wall and on the various contents of the cell, glycogen, enzymes, etc. 



Research on Yeast.f — H. Will finds that wild yeasts have a greater 

 persistence than the cultivated forms. He gives an account of the 

 conditions, temperature, light, etc., that influence the vitality of the 

 yeast cells. 



P. MazeJ gives an account of some new races of the yeasts of 

 lactose. These are to be found chiefly in soft cheese. He gives a long 

 account of their behaviour in different media, and discusses their 

 relation to the cheese. He thinks that probably they contribute to- 

 the aroma. 



Janssens and Mertens § have worked at one form, a rose-coloured 

 Torula, which forms an abundant coating over beer-wort- It develops, 

 better in the light than in the dark, and does not induce fermentation. 

 The nucleus of the Torula cell divides amitotically and very irregularly.. 



J. Warschawsky || relates the history of the various discoveries made 

 recently on the fermentation process and on the enzymes that cause the 

 fermentation, and he gives the results of his study as to the conditions, 

 under which the zymase is formed and stored up in the yeast cell. 



Studies of Uredinese.^f — E. Jordi describes a series of experiments, 

 with the rust Uromyces Pisi. He finds that there are two sharply 

 differentiated biological forms. The iEcidium form of each is on 

 Euphorbia ; the uredo- and teleutospore forms are on the two host- 

 plants, Lathyrns pratensis and Vicia Cracca. There is very little 

 morphological distinction between the spores of the two fungi. 



P. Cruchet**has tested the Uredinese found on Labiatae. He finds 

 biological forms there also. Spores that infected Mentha silvestris 

 refused to grow on M. aquatica and M. arvensis, and vice versa. He- 

 finds that JEcidium BruneUcc forms teleutospores on Molinia, and that 

 Puccinia Stachydis has no iEcidia, and is therefore a Brachypuccinia. 



Otto Schneider ff describes three species of Melampsora growing on 

 Salix. He made inoculation experiments with all of them, and gives, 

 the various results. 



* Zeitschr. Spiritesind., xxvii. (1904) pp. 96-239. See also Ann. Mycol., ii.. 

 (1904^ pp. 477-9. 



t Zeitschr. Gesamt. Brauw., xxvii. (1904) pp. 269-71. See also Centralbl. Bakt., 

 xii.'(1904) pp. 311-2. 



X Ann. Inst. Pasteur, xvii. (1904) p. 11. See also Centralbl. Bakt., xii. (1904). 

 pp. 312-4. 



§ La Cellule, xx., fasc. 2, pp. 353-68 (2 pis.). See also Centralbl. Bakt., xiid 

 (1904) pp. 314-5. 



|| Centralbl. Bakt., xii. (1904) pp. 400-7. IT Op. cit., pp. 64-72. 



•• Torn, cit., pp. 95-6. tt Tom. cit., pp. 222-4. 



