m 
PROTOZOA, 
flagellate Infusoria (Monads) from aggregations oi Bacteria into segmenting 
embryonal arese,” their subsequent transformation into Atncebce, and final 
dissolution into Bacteria ’f and the analogous tracing of the heterogenetic 
evolution of Paramecium (Nassula) from spontaneous aggregations of the 
granular elements of the pellicle. Apparently monads, Amoebce, or fungus- 
spores may develop quite arbitrarily from similar “ embryonal arose,” or 
from homogeneous plasmatic globules. According to the author’s observa- 
tions, the heat used in the preparation of the infusion will determine if, 
according to the greater or lesser deterioration of the organic substance, the 
ultimate results shall be a fungus, a flagellate, an Amoeboid, or a ciliate 
Infusorian. [These observations are chiefly confirmations of experiments 
made by Pouchet and others j but a critical repetition of them by equally 
competent observers of opposed views would be highly advisable,] On the 
question of Ileterogenesis ” and Archobiosis,’ cf. Hartley and Crace- 
Calvert, P. R. Soc. xii. pp. 140-157 and 186-191 j Calvert, Sanderson, and 
Ferrier, Rep. Br. Ass. xli. pp. 122-126. 
2. Grimm, O. Ueber Synura urellay Ehrbg., und Uroglena 
volvoxy Ehrb., und den wabrscheinlichen genetischen Zu- 
sammenbang der Catallacten mit den Schwammen (vorlauf. 
. Mittheil.). Nachr. Ges. Getting. 1872, pp. 539 & 540. 
Synura and Vroylena belong to flic Calallactcof and difler only from 
Mcyasphcera through the possession of a single flagellum. ' After the dis- 
solution of the colony the individuals change into Amoeba and encyst ; 
they also propagate through fission (budding). They are perhaps only a 
peculiar generation in the life -cycle of Sponges ! 
3. Euttle, Albert, One of our common Monads (Urella glau- 
coma, Ebrbg. ?). Am. Nat. vi. pp. 286-289, woodcuts. 
4. Marchand, Leon. De la reproduction des Animaux in- 
fusoires. (Etude medico-zoologique.) Paris : 1869. 2 pis. 
A review of what is kno,wn on the reproduction, encystment, &c. of In- 
fusona. The author’s attempts to prove the probability and accordance with 
nature of the heterogenetic (spontaneous) formation in organic liquors of 
the micro-organisms active in epidemic diseases, fermentations, &c., fall 
beyond the limits of this Record. 
5. Rossbach, M. J. Die rhythmischen Bewegungserscheinungen 
der einfachsten Organismen und ihr Verhalten gegen pby- 
sikalische Agentien und Arzeneimittel. Verb. Ges. Wiirz. 
ii. (1872), pp. 179-272. 
Observations on the contractile vacuoles of Infusoria and Amoeba, and on 
the influence of temperature, electricity, chemical and other agencies on the 
rhythmical contractions and retractile motions in Infusoria. 
W. S. Kent has laid before the Roy. Micr. Soc. observations on the minute 
collared flagellate Infusoria ( Codosiga, Bicosaga'), the striking resemblance of 
which to the cells lining certain cavities in Sponges was first pointed out by 
Clark. Of this tribe, pot hitherto observed in Europe, Kent has examined 
