259 : REVIEWS. 
tween such very dissimilar species as aizoides and mutata (page 253), or 
between granulata and cespitosa (page 205) e are not prepared to accept 
his interpretation of S. Andrewsii, which he treats as a hybrid between 
Geum and Aizoon, * Forma proprius ad Aizoon accedens" (page 252). 
This seems very unlikely, because in the structure of the flower, Geum and 
umbrosa belong to a group with the ovaries entirely superior, and Aizoon 
to one in which the inferior ovary is typically represented, and the flower 
of Andrewsii is precisely that of umbrosa, with only a difference in the 
mere size of the petals, and the leaf-pores and the leaf teeth are just these 
of umbrosa, the former not at all chalk-secreting. 
J. G. B. 
Introduction to the Study of Palaontological Botany. By J. H. 
BaLrous, A.M., M.D., F.R.S. Edinburgh, 1872. (Pp. 118.) 
A treatise on Paleontological Botany or Palzophytology has been long 
a desideratum for the geological student, and this is to some extent sup- 
Pattison, and notices of fossil plants in the different manuals of Geo- 
] € other works which may be usefully consulted by the 
nown, a 
ance in more fully perfecting the “ Introduction” Professor Balfour grate- 
fully acknowledges, 
_ This manual may be considered as a republication in a separate form of 
the 5th part, on Paleeophytology, of the author's Class Book of Botany , viih 
additional matter and illustrations, and is divided into sections comprising, 
amongst others, the determination and mode of preservation and methods 
9. examination of fossil plants, the Natural Orders and the successive 
periods of vegetation. The author adopts the o P 
sted A. Brongniart; the reign of Acrogens, Gymnosperms, 
and Angiosperms ; the first including the Paleozoic, the second the Me- 
sozoic, excluding the Cretaceous, and the third the Cretaceous and Tertiary 
fossil faunas, the fossil floras contain no new type, using the word in the 
most comprehensive sense, that is, as belonging to one or other of the five 
