Geology and Mineralogy. 331 
of the veins and amygdules were wiper in the veins or ree re 
where now found by waters, from an external source r the 
sandstones, conglomerates and traps bas been formed. He =" es 
not agree with Bowerman and Pumpelly that the copper was 
derived from the bandatone and thence carried down by hot or 
and has since been locally” concentrated, by percolating waters, in 
veins, amygdules and conglomerate beds. While rejecting the 
theory of Professor Dana with regard to the origin of the copper 
deposits, he agrees with him, it thus appears, in the view that the 
copper came up with the trap, but disagrees in that he makes the 
present distribution of a fa ik and also the filling of amygda- 
loidal cavities and veins by oe the result of a subsequent 
process we éige aves dow rd. 
The wri r has regarded it, n she has long since explained,* an 
the va - began to lose their chemical activity), and — to 
and below, the i igneous material soo later received 
joints; bu 
surfaces oe ovat joints oer it by their iron-rust discoloration. The gathering 
m the adjoining sandstone into the trap cavities by such anveeiotes 
waters oes to the writer to be not less impossible. 
