446 TRANSACTIONS OF THE CANADIAN INSTITUTE. [VoL. IV. 
and osmic acid, when properly employed, do not result in this condition. 
He pointed out further that the majority of the more recent investigators 
of the structure of the Cyanophycez had observed a colourless central 
body whose existence Fischer denies, and that the latter did not make 
sufficiently extended observations to justify such objections. 
Deinega’s' observations were made on Oscillaria princeps, O. Froeh- 
lichit, Aphanizomen flos-aque, Nostoc sp.. and Scytonema sp., and they 
dealt chiefly with the question of the presence of a nucleus and of a 
chromatophore, and with the nature of the granules in the cells of these 
organisms. According to Deinega, a chromatophore is present, and 
consists of a more or less perforated plate, apparently applied to the 
inner surface of the-cell wall, the trabeculae of the plate carrying the 
colouring matter, and running parallel, in the greater number of cases, 
with the trichome. 
He found only one kind of granules, and these manifested a certain 
special affinity for picrocarmine. In Osczllarza they occur chiefly in the 
immediate neighbourhood of the transverse walls. They readily dissolve 
in dilute hydrochloric acid and in chloral hydrate, while they remain 
uncoloured in solutions of iodine. Deinega does not accept the view 
of Cohn? and Hansgirg* that they are formed of paramylum, but he 
believes that they are composed of an isomer of starch. 
In regard to the question of a nucleus Deinega is undecided. He 
repeated some of Zacharias’ experiments with gastric juice, and found 
that in each cell of Osczllaria, after treatment with this reagent, the 
central body was provided with a nuclein lustre, but he attributes this 
to the remains of the chromatophore. He found, when examples of 
Spirogyra and other Alge were similarly treated, their nuclei vanished, 
while the chromatophore remained and gave a nuclein lustre. The 
central body of the cell in Cyanophycez stained more deeply than 
the remainder of the cell protoplasm, and consisted chiefly of a 
collection of granules. 
Zukal*t regards the central uncoloured portion of the cell as the cyto- 
plasm, and the coloured peripheral part as the chromatophore, which, 
under very highly magnifying powers, appears finely punctated, the 
r ‘‘Der gegenwartige Zustand unserer Kentnisse iiber den Zelleninhalt der Phycochromaceen,” Bulle™ 
tin de la Soc. impér. des Naturalistes de Moscou, Annee 1891, p. 431. A 
2 ‘‘ Beitrage zur Physiologie der Phycochromaceen.” 
3 ‘‘Physiologische und Algologische Studien” (1877). 
4 ‘‘Ueber den Zellinhalt der Schizophyten,” Sitzungsber. d.k. Akad, d. Wiss. zu Wien. Math.-Nat. 
Klasse, Vol. CI, p. gor. 1892. : 
