186 THE GRANITES OF MAINE. 
Watson, Thomas Leonard, and Laney, Francis B., with the collaboration of 
George P. Morrill. The building and ornamental stones of North Caro- 
lina: Bull. North Carolina Geol. Survey No. _. 1906. 
Williams, Ira A. The comparative accuracy of the methods for determining 
the percentages of the several components of an igneous rock: Am. 
Geologist, vol. 35, January. 1905. 
Wolff, John E. Details regarding quarries (granite): Tenth Census, vol. 10, 
1 888. 
Sec also the successive reports of the tests of metals and other materials for 
industrial purposes made at Watertown Arsenal, published by the United 
States War I department. 
The German periodicals named below also give results of tests of granite: 
Mitteilungen der technischen Versuchsanstalten zu Berlin. 
Mitteilungen tier Anstalt zur Prufung von Baumaterialien am Polytechnikunt 
. in Zurich. 
Mitteilungen aus dem aiechanisch-technischen Laboratorium der Koniglichel 
technischen Hochschule in Miinchen. 
The substance <>!' the paper l»y Merrill in vol. 10 of the United States Tentl 
Census. 1888, and by Merrill in the proceedings of the F. S. National Museum, 
vol. d. 1883, several times referred to. has reappeared in mere modern form ii 
his other works or is given in this report. 
GLOSSARY OF SCIENTIFIC AND QUARRY TERMS. 
,\i < i ssort: minerals in granite are original constituents of the rock, found only 
in small, often only in microscopic quantity. I See p. 17.) 
Anticline, a term applied t<» granite sheets or sedimentary beds that form an 
• arch. 
Ai-i.mi. Fine-grained granite, usually occurring in dikes and containing little 
mica and a high percentage of silica. 
Basic A term applied to rocks in which the iron-magnesia minerals and feld- 
spars with lime and soda predominate, such as diabase or basalts. 
Bowlder quarry. One in which the joints are either so close or so irregular 
that no very large blocks of stone can he quarried. 
Channel. A narrow artificial incision across a mass of rock, which, in the case 
of a granite sheet, is made either by a series of contiguous drill holes or 
by blasting a series of holes arranged in zigzag order. 
Cleavage, when applied to a mineral, designates a structure consequent upon 
the geometrical arrangement of its molecules at the time of its crystalli- 
zation. 
Close-jointed. A term applied to joints that are very near together. 
Crush-border. A microscopic granular structure sometimes characterizing ad- ■ 
jacent feldspar particles in granite in consequence of their having heer 
crushed together during or subsequent to their crystallization. 
Cut-off. Quarrymen's term for the direction along which the granite must b( 
Channeled, because it will not split. Same as " hard-way." 
Dike. A mass of granite, diabase, basalt, or other rock which has heen eruptec 
through a narrow fissure. 
Dimension stone. A term applied to stones that are quarried of required di 
inensions. 
