Feb., 1915.] Pnrmnylon in Euglcna Oxyuris Sc/imirrdn. ^51 



granule. It was, however, not until the succeeding day at 9:00 

 A. M. (Fig. 1, G), approximately 40 hours from the time of the 

 complete division that an irregular, but distinct granule became 

 visible. This gradually increased in size, but had not attained 

 its full development at the end of the day, when the observations 

 were brought to a close. The other twin individual had in the 

 meantime disappeared. 



There are two factors, however, which may have been instru- 

 mental in delaying the fomiation of the anterior granule, the 

 lowering of the room temperature nearly to freezing at night, and 

 the possible lack of the necessary nutrient material in the small 

 closed lens paper aquarium. 



While the synthesis of "paramylon," a term first suggested by 

 Gottleib, (1851) because of the similarity in chemical composition 

 to amylon (starch), normally occurs in connection with the 

 chloroleucites present in the Euglenidae, the question as to its 

 possible free formation as an assimilation product of the proto- 

 plasm has long been one of interest and one concerning which no 

 definite statement may up to the present time be made. The 

 mode of formation of the anterior paramylon granule in En glen a 

 oxyuris is extremely suggestive, however, that the result is due to 

 the activities of the protoplasm quite independently of the 

 numerous small chloroleucites present. Distributed irregularly 

 as they are throughout the cell body, it seems difficult to believe 

 that their products should unite to make a structure so definite 

 in form and position. 



The time taken for the division of the individual was 6^ 

 hours, with the assumption that the condition as figured in "B" 

 had occupied only a brief period. Keuten (1895) notes the time 

 of division in Euglena virdis as 3-4 hours. There are apparently 

 no notes concerning the time necessary for division among other 

 related forms, although Dofiein (1911) gives a comparative 

 table for various species of Protozoa. The factor is undoubtedly 

 a variable one and largely dependent on the surrounding conditions 

 particularly temperature and nourishment. 



BIBLIOGRAPHY. 



BuTSCHLi, O., 1906. Beitrage zur Kenntnis des Paramylon. Archiv fur 



Protistenkunde, p. 197, 1 Taf. 

 Dangeard, p. a., 1902. Recherches sur les Eiigleniens. Botaniste, ser. 8. 

 DoFLEiN, F., 1911. Lehrbuch der Protozoenkunde. 

 Gottleib, J., 1851. Ueber eine neue mit Starkemehl isomere Substanz. 



Ann. d. Chemie u. Pharmacie. Bd. 75, p. 51. 

 Keuten, L., 1895. Die Kernteilung von Euglena viridis. Zeit. wiss. Zool. 



V. GO, p. 215. 

 Klebs, G., 1881. Organisation einiger Flagellatengruppen u. ihre Bezie- 



hungen zu Algen u. Infusiorien. Untersuch. bot. Inst. Tubingen, Bd. 1. 

 ScHMiTZ, F., 1883. Die Chromatophoren der Algen, Bonn. 

 ScHMiTZ, P., 1884. Beitrage zur Kenntnis der Chromatophoren. Pring. 



Jahrb. Bd. XV, p. 1. 

 Oltmaxns, F., 1905. Morphologie und Biologie der Algen, Bd. 2, p. 151. 



Kenyon College, Gambler, Ohio, Dec. 24, 1914. 



