1896.] Petrography. 127 



Tassin, W— Directions for Collecting Minerals. Pt. II. Bull. U. S. Natl. 

 Mus., No. 39. Washington, 1895. From the Smithsonian Institution. 



Veth, P. J.— Overgedrut dit den Feestbundel van Taal-, Letter-, Gescheid-, en 

 Aardrjksknndige Bijdragen ter gelegenheid van zijn Tachtigsten Geboortedag- 



Weidman, S.— On the Quart/ Keratopliyre ana Associate! Hooks of the North 

 Range of the Baraboo Bluffs. Extr. Bull. I'niv. WUc, Science Series, Vol. 1, 

 No. 2, 1895. From the Editors of the Bulletin. 



White, D— The Pottsville Series along New River, West Virginia. Extr. 

 Bull. Geol. Soc. Am., Vol. 6, 1895- From the author. 



Williams. T.— Tin- Church's Duty in the Matter of Secular Activities. Ad- 



Tooth of Oryrhina from the Red ( 

 V, Vol. I, 1894. From the author, 

 i and Water Horizons in Southern . 

 te Geologist for 1893. Trenton, 18 



PETROGRAPHY. 1 



Igneous Rocks of St. John, N. B.— \V. N. Mathew has con- 

 tinued his work on the igneous rocks of St. John, N. B., 2 contributing 

 in a recent article an account of the effusive and dyke rocks of the 

 region. All the rocks described are believed to be pre-Cambrian in 

 age. They embrace quartz-porphyries, felsites, porphyries, diabases 

 and feldspar-porphyrites among the effusive rocks, and diorite-porphy- 

 rites, diabas— ilea among the dyke forms. In some 



of the quartz-porphyries perlitic cracks may still be recognized, and in 

 the felsite porphyries some spherulites. Tuffs of all the effiisives are 

 abundant. A soda granite with augite and green hornblende and 

 probably a little glaucophane wa> a bo met with. It is intrusive, and 

 has a composition represented by the figures: 



SiO, Ti0 2 A1,0 3 FeA FeO MnO CaO MgO Na 2 K 2 C0 2 Loss 

 64.86 .70 15.02 5.53 1.01 .18 2.61 1.42 3.92 2.37 .55 1.73 

 1 Edited by Dr. W. S. Bayley, Colby University, Waterville, Me. 



