1897.] Botany. 809 
SiOz TiO, Al2O3 Fe,03 FeO CaO MgO K,O NaO H,0 at 100 % HO at 100% +P205 
I. 77.68 14 11.81 .72 51 .72 18 5.00 2.96 .04 27 10 =100.13 
II. 67.45 .58 15.51 1.76 2.21 3.60 1.10 3.66 3.47 .14 63 12 =100.25 
Pegmatite.—As the conclusion of a very thorough discussion of 
the origin of pegmatite Crosby’ and Fuller declare that this rock is the 
product of crystallization from an igneous magma saturated with water 
—an igneo-aqueous solution. The authors, moreover, believe that no 
sharp line of distinction can be drawn between dykes and veins and, 
therefore, that veins are clearly entitled to some degree of recognition 
_ in the lithological classification. 
BOTANY: 
Gray’s Synoptical Flora.°—On the tenth of June, just twenty 
months after Fascicle I, Dr. Robinson brought out Fascicle II of the 
new edition of Gray’s Synoptical Flora of North America. It includes 
the “ orders ” Caryophyllacese (by B. L. Robinson), Ficoideæ (by B. 
L. Robinson), Portulacacese, Tamariscines (by B. L. Robinson), Elati- . 
nace, Hypericacez (by J. M. Coulter), Ternstroemiaceze, Cheirantho- 
dendrex, Malvaces, Sterculiaceze, Tiliaceæ, Linaces (by W. Trelease), 
Malpighiacex, Zygophyllacex, Geraniacese (by W. Trelease), Rutaceæ, 
Simarubaceæ, Burseraceæ, Anacardiacez, Meliaceæ, Aquifoliacese (by 
W. Trelease), Cyrillaceze, Olacinacese, Celastracee (by W. Trelease), 
Rhamnacez (by W. Trelease), Vitaceæ (by L. H. Bailey), Sapindacese 
(by B. L. Robinson), and Polygalacese (by B. L. Robinson). It is 
thus seen that of these twenty-eight families, twelve were prepared by 
other hands than Dr. Gray’s, and in several of the remaining sixteen 
more or less extensive revisions were made by Dr. Robinson. 
We note with interest the much freer acceptance of disputed names 
than in the previous fascicle ; thus we have Impatiens aurea Mahl. and 
I. biflora Walt. (instead of I. pallida Nutt. and 1. falva Nutt.); Vitis 
vulpina L. (instead of V. riparia Mx.); Vitis rotundifolia Mx. (instead 
of V. vulpina of American authors); Acer saccharinum L. (instead of 
A. dasyearpum Ehrh.) ; Acer saccharum Marsh (instead of A. sacchari- 
1 Technology Quarterly, IX, 1896, p. 326. 
* Edited by Prof. C. E. Bessey, University of Nebraska, Lincoln, Nebraska. 
° Synoptical Flora of North America, Vol. I, Pt. I, Fascicle II. Polypetale 
from the Caryophyllacez to the Polygalaceæ, by Asa Gray M. D., continued and 
edited by Benjamin Lincoln Robinson, Ph. D., pp, 207 to 506. Issued June 10, 
1897. New York, American Book Company. 
