Geology and Mineralogy. 401 
anists of the United States, who have also contributed to the 
expense of its preparation.” But the contributions must have 
been few and of comparatively small amount, while the labor has 
been protracted. 
The portion now issued covers the ground of the first volume 
of Torrey and Gray’s Flora of North America, i. e. of je fh ate 
petalous pe and ve therefore be regarded as a com- 
plete portion or volume. It is very pe a bibliography, but 
taking might suffice ; but it is a critical ovat and re-Investiga- 
into strong cloth binding; and that these may be obtained, from 
me curator of the Ha ae University Herbarium, at the addi- 
thre 
ot the bibliography of the subject. bhe placenta of Primulacee 
is con cluded to be “a direct prolongation of the receptacle or 
Trane The forms ee Be are cla — under eight re. sr 
lent kinds, five of which we — nnaiee ies or varieti 
of the imbricative; the term convolute ( n place of contorted) is 
this + Se, the degrees of frequency of the various kinds are 
indicated; the mode in w whiall they may pass into each other is 
speculated upon 
shown ; their origination under evolution with 
