204 THE JOURNAL OF BOTANY 
When the present “ane is scrutinized in order to ascertain 
how even Alge and Fungi are to be successfully brought within 
the limits of Ehirty lectures, it, is with some fon gE it is 
‘ha: ae hundred and thirty figures all but a very few are “ pro- 
cess” reproductions of excellent wall-diagrams prepared origi- 
nally, we learn, by oastoong Ritsema, and actually used in the 
illustration of the lectures. As each of these reproductions 
ae nearly half a so and contains often as many as a score 
of figures, the wealth of illustration may be imagined. The 
lectures themselves are thoroughly up-to-date, and there are no 
country but have been canvassed by the author. The portions 
dealing with Alge naturall ‘halla e Saaruicinies with Oltmann’s 
great work in two volumes which appeared in 1904-5, and to 
es 
mosomes, alternating with another generation whose nucleus con- 
tains 2 x-chromosomes, is one which the author seeks to apply to 
the Algze at every turn, and the recent great advances in our know- 
ledge of their cytology has furnished him Sep r material 
to this end. Indeed, the endeavour to disc at what Lema in 
the life-history of each organism that aeciackion of chromosom: 
ce which succeeds the doubling involved in the etal 
rocess is acknowledged By. ~~ author to be a dominating con- 
sideration throughout the w 
n the side of the hg is we have an,equally admirable 
ae of all the most recent contributions to knowledge. The 
phylogenetic conceptions of Brefeld are considered with due care, 
and the evidence sid ee existence of sexuality among Ascomycetes 
waa a with grea 
e vivacity - the $ style, the excellence of the illustrations, 
the wide knowledge of the author of the literature of the subject, 
and the judgment mevloyes by him in the statement of contend- 
ing views, combine to make Dr. Lotsy’s book a noteworthy addi- 
tion to the aera of botany. It will doubtless prove of great 
value both to teachers and students, and will induce them to look 
forward with interest to the promised volumes on ag 18 ete ate 
of the higher plants. R. W.P. 
