114 
At the October meeting we were favoured by the Eev. J. Bates 
with a very interesting paper on Fogs and Mists, which was 
profusely illustrated with diagrams and drawings; many of the 
latter were the work of a Norwich artist, the late Mr. Leman, 
kindly lent by Mr. Crompton. 
In January, Mr. H. D. Geldart read some very interesting notes 
on Seaweeds. The principal points alluded to in this paper were, 
1st, The Dimorphism of the Fructification of the Rhodosperms 
or Floridece, and the analogy of this Dimorphism to that found 
in other higher orders of Cryptogams ; and 2nd, The aggregate 
character of such Chlorosperms as Ulva. 
The true spores and tetraspores of the Rhodosperms were 
described in four different genera — Plocamium, Nitophyllum, 
Ceramium and P oly siphonia, and it was explained that the object 
of the two-fold fructification was not at all understood, but that it 
was supposed that while in the case of the true spores the descent 
of the species was direct, in that of the tetraspores there was an 
“ alternation of generations," the germination of the tetraspores 
producing in the first instance a prothallus unlike either the 
original parent or the second generation. In describing the 
Antheridia of tlio Rhodosperms the writer acknowledged that 
although he had seen them he had failed in either tracing their 
action himself, or in finding in any text book a definite account 
of how fertilization was effected by their means. 
The pseudo analogy between the true spores and the tetraspores 
of Rhodosperms and the Micro- and Macro-spores of Selaginella 
and Isoetes was alluded to, and the probable true analogy between 
the tetraspore and the primary four-fold aggregation of the macro- 
spore in Isoetes, and the development of the spores in Mosses was 
pointed out, and it was asserted that from specimens in the writer’s 
possession the primary four- fold division of the cell, which forms 
the tetraspore Callithamnion could bo shown. 
In speaking of Ulva it was shewn that from his own observa- 
tion the writer had come to the conclusion (which be had since 
found published by Professor Thiselton Dyer, in Art. “Biology” 
“Enc. Brit.”) that the frond of Ulva must be considered as an 
aggregate of simple forms of Alga;, having a true analogue in 
