Editorial Comment. ; *< s -' 
It is not the purpose of this article to notice these latter. 
but attention should be called to an abuse in misapplying 
a common word. This is not honest and it ought to be 
checked. The writer refers to the use of the term granite for 
rocks which are simply diabases. doleriteB, diorites or gabbros. 
Several instances of this were noticed in the labels of some 
rocks from Gettysburg, and some from Lancaster county. 
It is bad enough for a company to adopt a false name which 
it believes will aid in selling its commodity. The morality 
of this kind of thing cannot be defended, but it is quite in- 
excusable for the State, through its agents, to allow such rocks 
as •■( 'onewago Granite" to bear this name in a collection 
which is intended to instruct the unscientific visitor as to the 
resources of the state. 
The models of scientific objects and of the apparatus of 
the industries are various and creditable. Such are the 
model of the Philadelphia A- Heading company's coal breaker; 
and a model of an iron furnace in use 400 years B. ('. Still 
more interesting to the student of science are the raised 
models of the southwest end of the anthracite coal field, 
and the fine relief map of Pennsylvania on a scale of two 
miles to the inch (it^^o). and a vertical scale of o 400 • 
The same may be said of the relief models of Blair, Brad- 
ford, and Huntington counties; of the Cornwall iron mines ; 
the floor of the Mammoth anthracite bed, Schuylkill county: 
and the floor of the Mammoth vein, Panther Creek basin. 
Of the colored map of Pennsylvania, purporting to repre- 
sent the geology of the state, and dated 1893, like the preced- 
ing (from the late second geological survey of Pennsylvania), 
not so much can be said. Only an obsolete style of litholog- 
ical classification is attempted. To this is added a parallel 
column containing the geological systems, without, however, 
clearly defining to what lithological groups these latter divis- 
ions apply. Errors protested against, ten years ago. by the 
assistants to whose labors they were ascribed, still find a 
place on the state map. 
The collection of building -tones i> very creditable, includ- 
ing a large slab of black Pennsylvania marble. 
On the whole the exhibit from Pennsylvania is pleasing and 
somewhat imposing to the eye of the unscientific passer-by. 
