180 : THE JOURNAL OF BOTANY 
are described and thirty new varieties, in addition to which many 
forms are figured and described. Many known speciés are also 
illustrated to show the forms that were met with in this region. 
me of the new species are very characteristic, such as Cosmarium 
imulum, Xanthidium ornatum, X. paraguayense, 
: : h 
Wa. WEst. 
Sur la Transmissibilité des Caractéres acquis ; Hypothése d’une Centro- 
épigénése. Eucrnio Rignano. Paris: Felix Alean. 1906. 
5 frances. 
Tus 
forth by the various theories which, during the past twenty years, 
i ; a Under his 
n 
once more occupied, and is at this moment the scene of much dia- 
Hence, whether one agrees with his thesis or not, M. Rignano’s 
remainder o: the dy and limite a single zone, exercises upon 
whole org: » during its development, a formative action of 
an epigenetic character, with y becoming altered itself 
wa. 
as a result of its action. It is obviously impossible, within the . 
limits of this notice, to attempt any criticism of this thesis: but 
this may be said ion i 
the biological problems of the day. A serious study, we say advi- 
sedly, for the book is by | / x 3 
ter, but rather as close a piece of reasoning as one can expect to 
come across. 
B. C. A. Winpez. 
