Geology and Mineralogy. 261 
Colorado, an area 450 to 500 miles wide. The learned author 
remarks that the fact of the sudden appearance of the dicotyledons 
in the Cretaceous, and under numerous genera and species, through- 
out the northern hemisphere both in America and the eastern con- 
tinent, is as yet inexplicable. ‘“ Nothing in 4 Lapis strata,” 
he observes, “indicates the decadence of the r gn of gymnosper- 
mous plants, or shows any kind of difference which could lead one 
to presage the appearance of the dicotyledons.” This vegetation 
has been traced from ones land to Vancouver Island and along 
the Rocky ee region through Canada, to Colorado and 
Kansas, and in Europe to Germany, in about 40° north latitude. 
The printing of this Report has been delayed much since its 
completion. ‘The volume has been es baer during the month 
past. The title page bears the date 1 
Lesquereux states that ~ a aie of the a group, now 
over 150 i r, include only o and one dicoty- 
ledon (Populus primeva) of: the sit ‘adeurtben by Heer from 
the b enland, which this author refers to the 
bed A n 
ing to the genera Pinus, ee Win feld: ia , Platanus (P. Heerii) 
Ficus, Sassafras, Diospyros , Androm eda, Cissites, Magnolia, 
Liriodendr ron and Sapindus. 
4. Reports of the Tenth Census on Petroleum, Coke and Build- 
ing Stones, About 900 pages 4to, with pave plates. Census 
d 
office, Caartes W. Sxaron, Superintendent. ashington, 1884. 
—The reports included in this volume are: on the Production, 
Technology and uses of Petroleum and its products, b 
Prcxnam; The Manufacture of Co sepH D. WeEKs; 
ke P 
Building Stones of the United States and Statistics of the Quarry 
Industry for 1880. The third report was originally in the hands 
of Dr. George W. Hawes; after his lamented decease, the wor 
its prodt 
he subjects of Coke and Bailding Stones are present ted with 
a 
$s an important 
chapter by Dr. A. A. Julien, on the subject of “ The Durability 
of Building Stones in New York City and vicinity,” which has a 
wide bearing i in its facts and explanations. 
lume closes with a series of Shrawe brhegmphs (from 
the establishment of Bien & Co.) re se plea = s polishe 
marbles, . nd other rocks, which area rable; a volume 
b- 
