82 J. D. Dana’s Mineralogical Contributions. 
tallization to which the species belongs. The divisions are thus 
broken up into natural groups, to a considerable extent, and a very 
interesting exhibition of the relations of the species is afforded. 
f any objection can be made to this arrangement, it is one that 
science is not.at present able wholly to overcome. ‘There are 
various indications among the results of recent researches, that 
peroxyd and protocyd compounds cannot be necessarily separated, 
and also that Aydrous and anhydrous species may belong to one 
and the same group,—whether we adopt the views of Scheerer 
or not. Even in the method of Prof. Rose some exceptions are 
allowed, such as the placing of spodumene near augite, (rightly 
as we think,) although it belongs, in fact, to a following sub- 
division if the constituents of the species be considered. The 
exceptions are prophetic of a higher and wider principle than 
interest. hese v 
classification, and the chemical formulas of species, by one o the 
ablest mineralogists of the age, render the work of great value 
and authority in the science. 
4. Crystallization of Haydenite of Cleveland. 
| Haydenite from Jones’s Falls, Maryland, was described by Levy, 
as monoclinic in its crystallization, and he gave for the angle of 
the rhombic prism 98° 22’, and for the incli- 1. 
nation of the basal plane on the sides, 96° 5’, 
On account of the close resemblance of the 
species has long been suspected to be noth- 
ing but that species; but the difference in 
form and the angles, as well as in the anal- 
yses, has seemed to favor its being distinct. 
In some recent measurements, the writer ob- 
tained the angle 97°—98°, sustaining the ap- 
