APPENDIX. BOOK II. 



955 



On the Relation of Micro-organisms to Disease, Q^ J. M. S. 1881 : — Prazmowski, Unters. 

 lib. Entwick. und Fermentwirkung einiger Bacterien-Asten, 1880:— Papers in Nageli's 

 Unters. ueb. niedere Pilze, Munich, 1882 ; also Die niederen Pilze, 1877 (sanitary). 



Page 249. Saccharomycetes. Nageli, Ueb. die chemische Zusammensetzung der 

 Hefe, in Sitzungsber. d. Akad. d. Wiss. zu Miinchen, 1878; also, Theorie der Gahrung, 

 Munich, 1879 :— Hansen, Recherches sur la Physiologic et la Morphologic des Ferments 

 alcooliques, Copenhagen, 1881: — Reess, Ueb. den Soorpilz {O'idmm albicans, Robin), 

 Erlangen, 1877. 



Page 250, note 3 : for * Lebrbuch' read ' Lehrbuch.' 



Page 258. Note 2 : see also Book I. p. i6. 



Page 260. Diatomacese. For a full account of this group, see Pfitzer, Die Bacil- 

 larlaceen (Diatomaceen), in vol. II of Schenk's Handbuch der Botanik, part of the Scientific 

 Encyclopedia published by Trewendt, Breslau, 1882. 



Page 261. Myxomycetes. See de Bary, Morph. und Physiol, der Pilze, Flechten 

 und Myxomyceten : — Cooke, Myxomycetes of Great Britain, 1877. 



It has already been pointed out that the nuclei of the myxoamoebse which coalesce to 

 form the Plasmodium remain distinct, p. 945 ; hence the Plasmodium can no longer be 

 regarded as the equivalent of a zygospore, and the position of the Myxomycetes among the 

 Zygomycetes is untenable. 



Page 264. Zygomycetes. Van Tieghem, Nouvelles Recherches sur les Mucori- 

 nees, Ann. d. Sci. Nat., ser. 6, t. I :— Brefeld, Ueb. copulirende Pilze, Sitzber. d. Ges. 

 naturforsch. Freunde, Berlin, 1875, and Weitere Unters. {Mortierella), ibid. 1876. In 

 Mortierella the zygospore becomes enclosed in a capsule of pseudoparenchyma formed by 

 a felt of hyphae. Brefeld classifies the Zygomycetes as follows : — 



1. Mucorini (incl. Chsetocladiacese) with simple zygospores ; conidia formed by free 



cell-formation or by abstriction. 



2. Mortierellese ; zygospore enclosed in a capsule; conidia formed by free cell- 



formation. 



3. Piptocephalideae ; zygospore possessing a temporary growing point and under- 



going division to form three cells, one of which is the functional zygospore ; 

 conidia formed by division with subsequent rounding-off. 



There is some ground for believing that the Entomophthoreae belong to the group of 

 Zygomycetes (see note on p. 277). 



Page 271. Siphoneae. Since conjugation of zoogonidia has been observed to take 

 place in Botrydium and in Acetabularia these plants ought to be included among the 

 Zygosporeae in accordance with the classification followed in this work. See infra, note 

 on the Fucoideae. 



Page 275. Parthenogenesis of Saprolegnieae. De Bary concludes from ffis observa- 

 tions (Beitr. z. Morphol. u. Physiol, d. Pilze, IV, 1881) that, in Saprolegnia, Achlya, and 

 Aphanomyces, even when antheridia are formed and come into contact with oogonia, no act 

 of fertilisation takes place, that is, no part of the contents of the antheridium enters the 

 oogonium : hence the oospore is in all cases parthenogenetically produced. 



The following is a brief resume of the results of his observations on the oosporous 

 Fungi: — 



1. Pythium ; most of the protoplasm of the antheridium passes into the oosphere. 



2. Phytophthora ; a small quantity of the antheridial protoplasm enters the oosphere. 



3. Peronospora ; probably the same process as in the preceding genus. 



4. Saprolegnia, Achlya, Aphanomyces ; the antheridial tube does not open into the 



oosphere, and no passage of substance can be observed. 



5. Saprolegnia (5. torulosa, asterophora) ; the antheridia are closely applied to the 



oogonia, but no antheridial tubes, or only rudimentary ones, are developed. 



6. No antheridia developed. 



Page 278, line 9 from bottom; for ^ BulbocrcBte' read ^ BulbochcBte.' 



Page 281. Fucoideae. This group, like the Siphoneae (see supra), includes forms 



