285 
in regard to Discoveries in Crystallography. 
nection by which nature has joined the homogeneous individuals . 
But we will find the same notion sufficientjfar every purpose, 
if we add it to the series in the characters, of which the series 
of crystallization ought to be first considered. 
The importance of the series in general is so great, and their 
existence so obvious to every accurate observer of nature, parti- 
cularly in the combinations, and in the parallelism of the edges 
thus produced, that inadvertence to this can only be explained by 
some unnatural distribution, by some theory like that of the in- 
tegrant molecule, or by some artificial character. On account of 
their importance, I have taken the pains of examining all those 
of M. Weiss’s memoirs I could get at, to see whether I could 
not find any traces of such series. Indeed, in a paper on Cu- 
bicite, (rhombohedral kouphone-spar) M. Weiss mentions the 
two most common rhombohedrons of calcareous spar, (rhombo- 
hedral calc haloide), of which 66 the more obtuse arises from 
the equally inclined truncation of the terminal edges of the more 
acute one and he remarks, that, “ according to the same law, 
there exists a second more obtuse one, and a second more acute 
one, a third, &c.” He adds, “ In every rhombohedral system, all 
of these produce a principal series of rhombohedrons , with the 
first members of which those more particularly occurring in every 
such system commonly coincide, and between which , those that 
may happen to occur conveniently may be interpolated.’’ By 
this addition, 64 between which , &c. v he again extinguishes that 
light which observation had kindled. Besides this place, men- 
tion is made of series only in the Memoir on Epidote ; but 
there are series in the cosines according to odd numbers* “which 
cannot be referred to our subject. 
I leave the present subject with the remark, that the systems 
of crystallization of my method, cannot admit of any such sub- 
divisions as M. Weiss has introduced into his. In this pro- 
perty, too, they resemble the general notion of the natural his- 
tory species in the mineral kingdom, which admits of no divi- 
sions in subspecies. The differences occurring within the sys- 
tem in certain series of crystallization, refer only to Peculiarities 
in the Combinations of the simple forms. I have indicated these 
in both editions of the Characteristic, but more distinctly in the 
second, and in the first volume of the Treatise ; in the second 
volume I have called them the Character of the Combinations. 
