Review of Phillips's Mineralogy. 41 
If we leave out of view the different nature of the impregnation, 
in the Rhizocarpex and Selaginelle by free-swimming spermatic 
filaments, in the Coniferse by a pollen-tube (which perhaps de- 
velops spermatic filaments in its interior), the metamorphosis of 
the embryonal vesicle into the primary parent-cell of the new 
plant in the Conifers and Filicoids is solely distinguished, by the 
latter possessing only a single embryonal vesicle which completely 
fills the cavity of the central cell of the archegonium, while the 
former exhibits very numerous embryonal vesicles swimming in 
it, of which only one pressed into the lower end of the ‘corpus- 
culum’ becomes impregnated. The embryo-sac of the Conifers 
may be regarded as a spore which remains enclosed in its sporan- 
gium; the prothalliam which it forms never comes to light. The 
fertilizing matter must make a way for itself through the tissue 
of the Sporangium, to reach the archegonia of this protallium. 
“Two of the phenomena which led me to compare the embryo- 
sac of the Conifers with the large spores of the higher Crypto- 
gams, are common also to the embryo-sac of the Phanerogams: 
the origin from an axile cell of the shoot, and the independence 
of the surrounding cellular tissue (so striking, for example, in the 
Rhinanthacee, through the independent growth of the embryo- 
sac). By their pollen-grains producing tubes the Conifers are 
closely connected with the Phanerogams, from which they differ 
somuch in the course of development of their embryo-sac and 
the embryonal vesicles. The separation of the prothallium of 
the Conifers into a number of independent spensors, is a phe- 
homenon of a most peculiar kind, having no analogue throughout 
the vegetable kingdom.”—{ Loc. cit. pp. 139-41.)—A. H. De- 
cember 16, 1851 
a oes 
Anr. V.— Review of Phillips's Mineralogy by Brooke and 
Miller.* 
Tuts new edition of Phillips’s Mineralogy has for several years 
Past been looked for with ce interest. ‘The name of Phillips 
5 deservedly distinguished in British mineralogical science ; and 
the addition of the labors of Brooke and Miller has seemed to 
ise a work of unusual merit. The copartnership proves 
however to be one in which the older author has no concern or 
nightful title ; for scarcely a trace of the original labors of Phillips 
Fs en ee ee aT zs 
~ Au Elementary Introduction to Mineralogy, by the late Wm. Phillips. New 
Giition, with extensive slterstiops, god Ho 6 tat ALS leseke, F.RS, F.G.S., and 
isnt Miller, MA, F.RS. FGS. Professor Min, Univ. of Cambridge. 700 pp. 
*mo. London, 1852, Longman, Brown, Green aud 
Szcoxp Szeizs, Vol, XV, No, 43,~—Jan, 1853. 
