THE ANNALS 



A17D 



MAGAZINE OF NATUEAL HISTOEY. 



[FIFTH SERIES.] 

 No. 102. JUNE 1886. 



XLIV. — Contributions to the Knowledge of the Physiology and 

 Biology of the Protozoa. By Dr. AUGUST Gruber*. 



Introduction. 



In the following pages I propose to publish a series of ex- 

 periments and observations which may furnish a contribution 

 to the knowledge of the physiology of the Protozoa. TJie 

 work is not a finished whole, and, above all things, not an 

 exhaustive investigation ; it is intended only to assist in 

 furnishing materials for a structure which must still wait 

 many years for its completion. A part of the facts contained 

 in it I have already made public in preliminary communica- 

 tions t, and I repeat these here in a somewhat extended form. 

 Other experiments, on the contrary, have not hitherto been 

 published, and, indeed, have perhaps never previously been 

 made. May both be received with some interest in scientific 

 circles ! 



On artificial Divisihility and Pegeneration in the Protozoa. 

 Experiments have already been made in former years upon 

 artificial divisibility in the lowest organisms ; for example, in 



* Translated by W. S. Dallas, F.L.S., from a separate impression of 

 the paper in tlie * Bericlite der naturforsclienden Gesellschaft zu Freiburg 

 i. B./ Band i. (1886) Heft 2. Communicated by Dr. Wallich. 



t " Ueber kiinstliclie Theilung bei Infusorien," in Biologiscbes Central- 

 blatt, Bd. iv. pp. 717 722, and Bd. v. pp. 137-141. 



Ann. & Mag, N. Hist. Ser. 5. Vol. xvii. 33 



