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the knowledge we possess upon this matter. Baddeley in 
this Journal (‘ Q. J. Mic. Sci.,’ 1857, p. 189), fully described 
the process of division. On the other hand, the supposition 
of Busch that the youngest stage of Noctiluca proceed, from 
internal germ-bodies is not proved. Gosse (‘ Rambles on the 
Devonshire Coast, 1853’) endeavours to establish a reproduction 
by internal budding. Busch observed round, transparent 
discs, of the same size, consistence, and optical properties as the 
Noctiluce, often occurring among these. Their contents were 
nearly homogeneous, except at one spot where several yellow 
processes were remarked. Busch could not determine what 
relation these bodies bore to the Noctiluce. It is such bodies 
as these which Prof. Cienkowski has studied during April 
and May, 1870, at the Island of Prinkipo, off Constantinople. 
He has succeeded in tracing the formation of spores (drawn 
in the. woodcut), similar in appearance to those of some 
fungi, and swimming round about like algee-zoospores. 
F/C./ 
Swarm-spores of Noctiluca. 
The process of formation was inferred first from the obser- 
vation of different specimens, and then traced by direct ob- 
servation step by step in the same individual through some im- 
portant stages, though it was not possible to do so throughout. 
It is exceedingly difficult to keep the same Noctiluce during a 
length of time for observation. Prof. Cienkowski found that 
placing them in a drop of water on a thin glass cover which 
was placed over a moist chamber so as to exclude all access of 
