230 BOTANICAL GAZETTE [MARCH 
conclusions of Kout and a reiteration of the principal results of his paper of 1890. 
kérner,” or slime globules. While ZacHarias denies that it has been proved 
that the central body contains any granules other than the “Zentralk6rner,” yet 
he leaves the question still open as to the possibility of the existence of chromatin 
in this enigmatical body. He asserts strongly his belief, however, after an exam- 
ination of the preparations of both Kout and HEGLER, that there are no structures 
present which can be called chromosomes, as maintained by Kout and BiTscHtt. 
ZACHARIAS adds in the present paper some new observations on the nature 
of the cyanophycin granules. After repeating his earlier experiments on the 
effects of dilute HCl, he comes to a conclusion somewhat at variance with his 
earlier results, namely, that the granules in certain cases are not actually dis- 
solved by the acid, but that nevertheless they undergo some change. He con- 
cludes, further, that there is no difference in the behavior of the cyanophycin 
toward dilute HCl and toward pepsin, thus disputing the results of HEGLER and 
Kout. The author as well cannot agree with these investigators in their conclu- 
sions as to the albuminous and crystalloidal nature of the cyanophycin granules, 
although he adds nothing in support of his earlier supposition of their carbohy- 
drate nature. 
In regard to the duration of cyanophycin in filaments grown for a long time 
in the dark, Zacwartas differs from HEGLER and Kout in asserting that there 
is no complete disappearance of cyanophycin and slime.—Epcar W. OLIVE. 
KoERNICKE reviews critically the present condition of researches upon the 
plant cell,*? confining his attention to the morphological aspect now commonly 
spoken of as cytology. A little more than one half the work is devoted to the 
cytoplasm, the rest dealing with the nucleus. 
That modern preparations do not show a series of artifacts but give a reliable 
view of structures, is proved by observations upon living material. The cytoplasm 
is regarded as consisting of two distinct substances, the kinoplasm and the tro- 
phoplasm. Spindle formation is described in all groups and the various views 
are clearly presented. The centrosome problem is discussed at some length. 
impartial summary of the literature dealing with the blepharoplast is given, 
but the author expresses no opinion as to its homology. The nuclear membrane, 
cell plate, and Hauéschicht are regarded as kinoplasmic structures. The pat 
graphs on protoplasmic continuity are especially valuable because the important 
Investigations are so recent. Less attention is paid to the cell wall. 
In treating the nucleus, the author deals principally with the works which 
have appeared since 1896, the date of Zimmerman’s book on the nucleus, sinc 
when many investigators have studied the nuclei of the lower plants, especially 
the schizophytes and yeasts. Of course, the discussion of the chromatin occuples 
most of the space devoted to the nucleus. It is rather surprising that the Chara- 
*7 KOERNICKE, M., Der heutige Stand der pflanzlichen Zellforschung- esas 
Deutsch. Bot. Gesells. 21 : Generalsammlungs-Heft 66-134. 1904- 
