APPENDIX. BOOK II. 
955 
On the Relation of Micro-organisms to Disease, J. M. S. 1881 : — Prazmowski, Unters, 
üb. 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. Nägeli, Ueb. die chemische Zusammensetzung der 
Hefe, in Sitzungsber. d. Akad. d. Wiss. zu München, 1878; also, Theorie der Gährung, 
Munich, 1879 : — Hansen, Recherches sur la Physiologie et la Morphologie des Ferments 
alcooliques, Copenhagen, 1881 : — Reess, Ueb. den Soorpilz {O'idium albicans, Robin), 
Erlangen, 1877. 
Page 250, note 3 : for ' Lehrbuch' read ' Lehrbuch.' 
Page 258. Note 2 : see also Book \. p. 16. 
Page 260. Diatomaceae. For a full account of this group, see Pfitzer, Die Bacil- 
lariaceen (Diatomaceen), in vol. H of Schenk's Handbuch der Botanik, part of the Scientific 
Encyclopedia published by Trewendt, Breslau, 1882. 
Page 26L 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 myxoamoebae 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. Sei. 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 hyphse. Brefeld classifies the Zygomycetes as follows : — 
1. Mucorini (incl. Chaetocladiaceae) with simple zygospores ; conidia formed by free 
cell-formation or by abstriction. 
2. Mortierelleae ; zygospore enclosed in a capsule; conidia formed by free cell- 
formation. 
3. Piptocephalidese ; 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 Entomophthorese 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 his observa- 
tions (Beitr. z. Morphol. u. Physiol, d. Pilze, IV, 188 1) that, in Saprolegnia, Achlya, and 
Aphammyces, 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. Pytbium ; 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, aster op bora) ; 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 ^ Bulb oc rate' read ^ Bulbocbcste.' 
Page 281. Fucoideae. This group, like the Siphoneae (see supra), includes forms 
