ALG^. 
83 
glutinous state ; the gems also of the unciliated embryos, 
formerly globular, now become oblong; the projections and 
protean bodies appear first. The Spongillce which are formed 
in this threefold method are the same. The Spongillce in the 
third state appear to be first covered with a membrane, and, 
upon its bursting, the cavities and the eggs are seen. The 
propagation through protean pieces only takes place in very 
young individuals, which are produced from non-ciliated em- 
bryos, as the self-division (scissiparite naturelle) only takes place 
in old individuals, which have been produced from the same 
embryos. In the third memoir, he compares the non-ciliated 
free embryos of the Spongilla, with the free embryos of Ecto- 
sperma clavata. The former move about from two to three 
days, whilst the latter only move from two to three hours, 
or even immediately establish themselves. Upon applying a 
magnifying power of 2-300. i. d., the fibres of the embryos of 
the Spongilla were distinctly seen, but not in those of Ecto- 
sperma ; the former also have a current around them, but the 
latter have not. The embryos of the Spongilla are white, 
those of the Ectosperma are green. 
I may here refer to some observations of Agardh, in Suensk. 
Vetensk. Hdlgr. f. Ar, 1837, translated in the Flora for 1840, 
p. 128, where he states, that a Draparnaldia tenuis developed 
itself from moving granules ; also, that he observed a move- 
ment of the granules in the articulations of the Bryopsis 
arhuscula. M. Morren’s observation, that he found the Rotifer 
vulgaris in Vauclieria clavata {Ectosperma cl.), in such a 
position that it could not be removed on the opening of the 
articulation, is worth attention. Bullet, d. I’Acad. Boy. d. 
Bruxell., vol. vi. p. 4. 
The current of fluid, observed by M. v. Lobaczewski, in the 
Closterium lunula, Nizsch, described in the Linnsea, vol. xiv. 
I must leave to the Zoologists, although the phenomenon is 
very similar to those which have been observed in Chara and 
other plants. 
The observations too, which Meyen has made with regard to 
red snow, in Wiegmann’s Archiv, 1840, vol. i. p. 166, belong 
to Zoology, in as much as Proto coccus nivalis and viridis are 
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