Protozoa. 101 



mentablenkung) gelingt es Protozoen, -vvelelie demselben Genus angehören, zu 

 unterscheiden. Verf. arbeitete mit Kulturen zweier freilebenden Amöben; die 

 Immunisierung der Versuchstiere (Kaninchen) gelingt leicht durch wenige intra- 

 venöse Injektionen der gewaschenen Organismen. Für die Reaktion der Kom- 

 plementablenkung sind in jedem Röhrchen mindestens 1800000 Organismen 

 nötig. Seitz (Bonn). 



246) Stolc, A., chovani so indomodfi v zive protoplasme. (Über das 

 Verhalten des Indigoblau im lebenden Protoplasma.) In: Biologicke listy, Bd. 1, 

 Heft 1, S. 13—16, 1912. 



Die Versuche wurden an Pelomyxa gemacht. Es zeigte sich, daß das 

 Indigoblau, von Pelomyxa aufgenommen, längere oder kürzere Zeit im lebenden 

 Protoplasma verweilt, ohne irgendwie verändert (weder oxydiert noch reduziert) 

 zu werden, und schließlich ausgeschieden wird. Bruno Kisch (Prag). 



247) Strickland, E., (Cambridge, University). Gregarines in Rat-fleas. 

 In: Proc. Cambridge Philosoph. Soc. 16, 6, S. 460—461, 1912. 



Describes the nuclear changes in the life-history of the Gregarine of the 

 Rat-flea Ceratophylhis fasciaius. These changes differ so much from those obser- 

 ved in all other Gregarines that the author proposes a new family, Agrippini- 

 dae, and names the species Ägrqypina 'bona nov. gen., nov. sp. 



Doncaster (Cambridge). 



248) Swing'le, Leroy 1)., The Relation of the Sheep-tick Flagellate (Crithi- 

 dia melophagia) to theSheep's Blood. In: Wyoming Agr. Expt. Stat. Bul. No. 91, 

 S. 1—15, 1911. 



Crithidia melophagia, the flagellate found in the sheep-tick, is not connected 

 in any "way with a sheep trypanosome as has been maintained by other workers. No 

 phase of its life history is undergone in the sheep as a host. It cannot be communi- 

 cated to the sheep by the bite of the tick, or by mechanical inoculation or by feedmg. 



Pearl (Orono). 



249) Woodruff, Loraildo Loss, Evidence on the Adaptation of Para- 

 maecia to Different Environments. In: Biol. Bull. XXII, No. 1, Decem- 

 ber 1911, S. 60—65, 2 figs. 



In a paper in the Archiv für Protistenkunde the author showed that I'ara- 

 maeciunt aurdia undoubtedly has unlimited power of reproduction without con- 

 jugation or artificial Stimulation. A culture of P. caudatnm was started for com- 

 parison and was carried from May 14, 1910 to December 1, 1911. 



While the method of experimentation did not absolutely exclude the possi- 

 bility of conjugation, it nevertheless rendered it fairly improbable, and the cul- 

 ture was in as healthy a condition as at the beginning of the work. The author 

 is inclined to the opinion that the conditions of the experiment may be the 

 causes of the cycles observed by previous investigators. He concludes: 



„1. The discrepant results of various workers on the longevity of Paramaecia 

 is in all probability due to variations in the cultural demands of the races iso- 

 lated for study. 2. It is probable that most, if not all, normal individuals have, 

 under suitable environmental conditions, unlimited power of reproduction without 

 conjugation or artificial Stimulation." Lillie (Chicago). 



