BOOKS FOR STUDENTS 265 
Tue higher text-book of botany—the general treatise embodying 
all the more important phases of the science, for the use of advanced 
students—is out-of-date. It is analogous with the professor of 
natural history, who presumes to profess several sciences to only 
ne of whi 
ledge should be derived from one book. The labour attending the 
preparation of such a work must be enorm ui u 
proportion to any kind of remuneration which is likely to accrue. 
We cannot a i 
scientific principle of differentiation of labour, as was done in one 
of the best of its kind, that for which Prof. Strasburger and his 
colleagues of Bonn University were responsible. 
e are fifteen chapters in Professor Campbell's book. The 
first is introductory ; the second and third, entitled the Plant-body 
i d on the arrangement given in Engler & Prantl’s 
Tora amilien, and the author does not take account of the recent 
which 
group. 
ace the Gymnosperms is less satisfactory. Recent 
researches have brought to light several points in the anatomy of 
nd vegetative organs, which are of much interest in phylogeny. 
se : 
described : ‘In the middle of the leaf are the two vascular bundles, 
