148 The American Naturalist. [February, 
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other Water Animals in the Pacific States. Art. 10, Bull. U. S. Fish Commission 
for 1895. Washington, 1896. From the Commission. 
SmYTH, C. H.—Metamorphism of a Gabbro occurring in St. Lawrence Co., N. 
Y. Extr. Amer. Journ. Sci., Vol. I, 1896. From the author. 
Transactions of the Wisconsin Academy of Arts, Sciences and Letters, Vol. X. 
Madison, 1895. From the Academy. 
VAN BIERVLIET, J. J.—Eléments de Psychologie Humaine. Paris, 1895. From 
the author. 
Watcott, C. D.—Fossil Jelly-Fishes from the Middle Cambrian Terrane. 
Extr. Proceeds, U. S. Natl. Mus., Vol. XVIII. Washington, 1896. From the 
Weeks, F. B.-—Bibliography and Index of North American Geology, Paleon- 
tology, Petrology and Mineralogy for 1894. Bull. U. S. Geol. Surv. No, 135. 
Washington, 1896. From the Survey. 
Wuire, C. A.—The Bear River Formation and its Characteristic Fauna. Bull. 
U. S. Geol. Surv. No. 128. Washington, 1895. From the Survey. 
Woopvwarp, H.—Address delivered at the Anniversary Meeting of the Geo- 
logical Society of London, Feb, 15, 1895. 
General Notes. 
PETROGRAPHY.’ 
Petrography of the Viterbo Region, Italy.— Washington’ 
continues his description of the young volcanic rocks of Italy in an 
article dealing with the lavas of the interesting Monti Cimini, Monte 
Venere and Monti Vico. The principal rocks of the district are vul- 
sinite, composed of phenocrysts of orthoclase, plagioclase, diopside and 
biotite in a trachytic groundmass consisting of diopside, magnetite and 
the feldspars ; ciminite composed of small olivine, diopside, plagioclase, 
and sanidine phenocrysts in an andesitic felt of diopside needles, mag- 
netite grains and feldspar laths—both orthoclase and plagioclase ; 
peperino—a trachy andestic tuff, and a series of leucite rocks belongmg 
with the leucite phonolites. The phonolites from Monte Venere are 
characterized by the presence of phenocrysts of biotite. Analyses of 
the three principal types are given as follows: 
SiO, Al,O, Fe,O, FeO MgO CaO Na,O K,O H,O TiO; 
Vulsinite 57.32 19.85 2.21 2.35 1,603.82 3.22 9.15 :57  ==100.09 
Ciminite 55.44 18.60 2.09 4.48 4.75 6.76 1.79 6.63 .25 .16 =100.75 
Leucite phonolite 55.21 19.81 2.69 2.86 1.68 4.61 3.13 845 .99. tr= 99° 
1 Edited by Dr. W. S. Bayley, Colby University, Waterville, Me. 
2 Journal of Geology, IV, p. 826. 
