PROCEEDINGS OF SOCIETIES. 313 
the development of an entirely new form, from a long 
“vibrion.” He thus describes this new type: “It was an 
annulated vermiform animalcule, the ring being quite distinct, 
and each one furnished with cilia. The whole series of cili ia 
extending along the body acted in concert, imparting to the 
animalcule a motion precisely resembling Nais amongst fresh 
water, and Nereis amongst marine annelides. 
Beyond the distinct flashing of the cilia (of which he could 
not count the number on each ring), a circlet on the anterior 
segment, and what appeared to be a canal running through 
the whole length of the body, neither organs nor members 
could be traced. Each ring had, however, a distinct existence, 
for they were cast off from time to time, and moved about 
freely. The animalcule grew by the subdivision of its 
ring, and became divided by their separation. It moved 
freely backwards or forwards, and often when divided into 
two parts, which remained attached to one another, an in- 
dependent ciliary action was noticeable on each, but not such 
as to interfere with the movements of the whole. 
He further described how its annulated structure was 
gradually converted to a smooth surface; and some other 
Epanzes which he observed. Its length varied from ;+, to 
= iol and he regarded it as a larval form, or series of 
forms, bearing the same relation to some other (unknown) 
Infusorium as the Strobila larva does to some of the 
Medusee. 
In the dust of Japan he followed the development of a 
monad, first into what appeared to be a minute paramecium, 
then into Lowxodes cucullulus (Dujardin), and finally imto 
Colpoda cucullus (Dujardin), and his experiments are quite 
confirmatory of the supposition that many Infusoria now 
classed as distinct types are really one and the same species 
in different stages of development. 
He also found, as stated by Dr Wallich, that certain 
Ameebee (A. radiosa) are only another stage of others that 
have been described as distinct types, just as in the case of 
the Infusoria. Our space will not admit of our transcribing 
more of these experiments, the recital of which was profusely 
illustrated with diagrammatic plates, but we believe our 
readers will agree with us that they open out an entirely new 
field for microscopists, and deal a heavy blow at the doctrine 
of heterogenesis as at present understood. Mr. Samuelson’s 
conclusions are in one sense rather amusing. 
In drawing attention to the tenacity of life possessed by 
the germs which were revived under his eye, he says that, in his 
case, they survived the heat of a tropical sun and the warmth 
