Books and Pamphlets received. 231 
anum Menegh., var. granulatum Rabh., was begun. It produced new 
colonies on June 6th. One of the latter was again selected for ob- 
servation, the others not being removed. Its development could be 
studied with the greatest ease in all its stages, and on June 25th a third 
generation was produced, which is now developing, although I must 
say it does not seem to flourish. The first generation belonged dis- 
tinctly to the above-mentioned variety of P. Boryanum ; its membranes 
were strongly ‘ granulated/ The second generation reached the same 
size as the former, and was in all respects like it, but its membranes 
were only slightly ‘ punctate/ It had therefore to be referred to the 
true P. Boryanum [P. Boryanum, Menegh., a.genuinum , Kirchner 1 ), 
or at least to some variety which was not the var. granulatum. It was 
thus shown that these two rather extreme forms belong to one and 
the same species, and do not even deserve to be distinguished as 
varieties. 
If nothing else could be gained with the arrangement I have de- 
scribed than to show to what extent Algae vary, and thus to reduce 
the confusing synonymy in this branch of Botany, it should recom- 
mend itself to all those interested in its study, but it is obvious that 
other and more important problems may be solved by its aid. 
SELMAR SCHONLAND, Oxford. 
BOOKS AND PAMPHLETS RECEIVED. 
D’Assier: Note sur le Transformisme. Bordeaux. — Baker : Handbook of the 
Amaryllideae, including the Alstroemericae and Agaveae. George Bell & Sons, 
London, 1888. — Cash: On the Fossil Fructifications of the Yorkshire Coal 
Measures. (Proceedings of the Yorkshire Geological and Polytechnic Society), 
1887. — Christy & Co. : New and Rare Drugs, being a concise reference to the 
uses, doses, and Preparations of some 250 of the latest introduction. London, 1888. 
— Cohn : Bericht fiber die Thatigkeit der botanischen Section der Schlesischen 
Gesellschaft. Barth & Co. (W. Friedrich), Breslau, 1887. — Cohn und Engler : 
Das Botanische Museum der Universitat Breslau. J. U. Kern’s Verlag (Max 
Mfiller), Breslau, 1888. — Delpino : Funzione Mirmecofila nel Regno Vegetale. 
Bologna, 1888. — Elfving : Zur Kenntniss der Krfimmungserscheinungen der 
Pflanzen. Helsingfors, 1888. — Geddes : The rise and aims of Modern Botany. 
John Long & Co., Dundee, 1888. — Gibson : The History of the Science of 
Biology. J. A. Thomson & Co., Liverpool, 1888. — Id. : On the Ter- 
minology of the reproductive organs of plants (Proc. Biol. Soc. Liverpool), 
1 Kryptogamen-Flora von Schlesien. 2 Bd., Erste Halfte. Algen von Dr. 
Oscar Kirchner. 
