PROTOZOA. 
639 
Schmidt, O. Vorlaufiger Bericht liber die Untersueliung der 
Bowerbank^selieii Spongien. Sitzungsb. Akad. Wiss. Wien, 
Band liii. pp. 147-151. 
Schwalbe, G. Ueber die eontraetilen Bebiilter der Infusorien. 
Arehiv f. mikroskop. Anat. Band ii. Heft 2 & 3, 1866 
(Oct. 18), pp. 351-371. 
Stuart, A. Ueber Coscinosphoira ciliosa, eine nene Badiolarie. 
Zeitscbr. f. wissensch. Zoologie, Bd. xvi. pp. 328-345, 
Taf. 18 : Sept. 1866. 
Zenker, W. Beitriige zur Naturgescbichte der Infusorien. 
Arehiv f, mikroskop. Anat. Band ii. Heft 2 & 3, 1866 
(Oct. 18), pp. 332-348, Taf. 19. 
I. INFUSORIA. 
Spontaneous [feneration. Donne (1. c.) gives an account of some experi- 
ments conducted for tlie purpose of determining the possibility of spon- 
taneous generation. Hens’ eggs were wrapped up in cotton, which had been 
exposed to a high temperatiue, the summit of the egg was pierced by a red- 
hot stylet, and the contents placed in communication with air which had 
been filtered free from germs ; in a short time, three or four weeks, the 
appearance of organized vegetable filaments was noticed. When a small 
portion of distilled water was added, then, in the space of twenty-four hours, 
Monads and Vibrios were developed in myriads. 
Pasteur replies to these observations of Donnd (Oompt. Rend. 1. c. p. 305) 
that the oxperimonts referred to are not free from many sources of error, 
which ho very briefly alludes to. 
DonnA in a second paper (/. c. p. 1072), gives an account of further experi- 
ments in which he had taken great care to exclude all sources of error, and 
yet, after all, auimalcula were, found to abound. 
Pasteur (1. e. p. 1073) once more points out the probable source of error 
in these latter experiments, and pronounces as his fixed opinion that, in the 
actual state of science, heterogeny is a chimaera. 
Here also may bo mentioned Cantoni, Di alcune esperienze sulla gene- 
razione spontanea, eseguite in unione col prof. Oehl,” Peal. Istitut. Lomb. 
vol. ii. pp. 309-311, and Cavalleri, ‘‘ Di alcuni esperimenti intorno alia 
questione della generazione spontanea degli infusorj,” Ibid. pp. 331-348. 
Pulsatile vesiele. Zenker gives a detailed account of this vesicle (/. c. 
p. 332), and believes that the pulsation must be regarded as a process of 
respiration. 
Here we would also refer to SciiwALBii’s paper (1. c.), which does not admit 
of being abstracted. 
Vorticella. Zenker (/. c. -|). 344) believes tliat the stem of Vorticella is 
much less complicated in its structure tlian the arms Aeinela\ but ho 
asserts the presence of muscular tissue. 
Acineta ferrum equinum. Zenker (1. c. p. 340) describes the contractile 
arms of this species. Taf. 19. fig. 1 a-j. 
Anthophysa mulleri (Bory). Clark (/. c.) gives a detailed account of this 
