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good opportunity of seeing that those filamentous substances form 
immediately on the contents of the spore dissolving, each spore 
giving birth to a number of them. In some cases the contents 
appeared to be composed of elongated particles while in situ, 
before they issued from the spore. The question arose as to 
whether each of the filamentous threads, under favorable circum- 
stances, was capable of ultimately giving rise to a new plant, or 
whether a number of them coalesced to form one — which was 
left undecided until further observations are made. 
Mr. Crowe exhibited a section of flint, having not only the 
usual so-called Xanthidia imbedded in it, but likewise showing in 
section a fragment of some coniferous wood, with its characteristic 
pits. e 
Eev. E. O’Meara showed his original drawings of sundry nne 
Diatoms, and gave their characters and distinctions. These wt 
named Pleurosigma giganteum, var. baccatum, Plagiogramma c<he 
tatum, Melosira Wrightii, Pinnularia marginata, P. scutelluixa 
Amphiprora costata, and were to appear in next number of the 
‘Microscopical Journal.’ 
Dr. Moss, R.N., exhibited a series of sketches from nature of 
Mediterranean and Atlantic forms of Appendicularia, and of the 
enigmatical “ Haus of Merten’s,” in which they were often found 
enclosed. He remarked that this curious structure seemed to be 
associated exclusively with the oval-bodied or thoracic Appendi- 
cularia, of which A. flagellum might, perhaps, be regarded as a 
type. In two specimens of A.furcata captured near the Azores in 
February, 1869, an organism resembling in form the oval-bodied 
Appendicularia, and appearing from its motion, attachment, &c., 
to be embryonic, was found on the right neural portion of the 
upper part of the branchial cavity, a short distance below the 
base of the lowest of six oral tentacula, in very much the same 
situation in which Gegenbaur described and figured an unsym- 
metrical ciliated orifice. Observations calculated to throw light 
upon a subject so obscure as the reproduction of these animals 
must necessarily be advanced with caution, but there are grounds 
for the hope that ere long we will be as well acquainted with the 
Appendicularia as with their pelagic brethren, the Salpas and 
Pyrosomas. 
Mr. Woodworth exhibited a series of excellent photographs of 
various microscopic objects, which he presented to the Club. 
Mr. Tichborne exhibited a slide of Sulphate of Copper, crystal- 
lized at 75° Fahr. This formed a beautiful polariscope object of 
a peculiar form. This salt, which has a normal composition of 
CuS0 4 , 5H 2 0, loses part of its water of hydration at elevated 
temperatures, and crystallizes in a form quite distinct from the 
ordinary one. 
Mr. Archer drew attention to some examples of a very minute 
organism which he had detected in several gatherings lately, and 
which he must, he thought, have hitherto overlooked, for he now 
found it not very uncommon ; it was, however, one which as yet 
