476 Scientific Intelligence. 
wes 
than the argillyte; and Mr. Wadsworth also observes that the 
conglomerate is of different age from the Roxbury conglomerate 
of the same part of the Boston basin 
. Jointed structure in rocks,—In a paper on the origin of 
jointed structures, in the Proceedings of the Boston Society of 
Natural History for October, 1882, p. 72, Professor W. O. 
Crospy explains the joints ordinarily so-called, having great uni- 
formity in direction, to the vibrations of earthquakes, stating that 
the character of the vibrations is such as necessarily to produce 
fractures, and that all formations have been subjected to sever 
shocks of indefinite number. 
Note on Jointed structure.—It would appear from Mr. W. 
J. McGee’s note (this Journal, February, 1883, p. 153), that his 
observations on jointing are strongly in favor of their being due 
to the contraction of rock masses. As has been mentioned in 
es es 
ut in depth they have not opened, being still mere lines, that 18, 
he “ head ” 
. ;. H, KINAHAN. 
9. Origin of the Crystalline Ivon Ores.—Dr. A. A. Julien read 
a paper on this subject before the New York Academy 0 
Sciences, in October last (Trans. N. Y. Acad. Sci., ii, p. 6) 
of magnetite.” Dr. Newberry discussed the subject in reply, 
admitting that some beds may have been made by “the sorting 
wer of shore waves,” but urging that such cases are excep- 
tional, and arguing in favor of the more common theory that they 
