305 
through the Himalaya Mountains. 
silver cases : all carry iron-pipes of the same shape as those used 
by labourers at home, and the higher classes have them gene- 
rally ornamented with silver. In common with the inhabitants 
of Koonawur, the greater part of them have a flint and piece of 
steel for striking fire, attached to their apparel by a metal chain. 
The women, whose dress resembles that of the men, were lite- 
rally groaning under a load of ornaments, which are mostly of 
iron or brass, inlaid with silver or tin, and beads round their 
necks, wrists, ancles, &c. and affixed to almost every part of 
their clothes. 
Art. XVIII. — A comparative View of the Series of Crystalli- 
sation of Epidote and of Glauber-Salt. By William Haii>- 
iNGER, Esq. F. R. S. E. Communicated by the Author. 
ARious opinions have hitherto prevailed among mineralo- 
gists relative to the question, whether several species with forms 
of variable dimensions, possess exactly the same form, or whe- 
ther they all differ from each other in these respects. This 
however, is a matter which will probably remain unsettled for 
some time, although good authorities may be quoted in favour 
of either of the two different cases. With the exception of 
those minerals whose forms are comprised in the tessular sys- 
tem, the Abbe Haiiy took for granted that every species would 
have its peculiar series, or, as he used to call it, its peculiar sys- 
tem of crystallisation. This very probable supposition found 
numerous adherents, and was generally received, when Profes- 
sor Mitscherlich published his interesting labours on the isomor- 
phous bodies, in which he asserted the perfect identity of the 
crystalline forms presented by several substances. The follow- 
ers of a contrary opinion have brought forward instances, where 
the coincidence of the angles in two different species, containing 
isomorphous substances in the required proportions, does not 
take place rigorously ; but many accurate observations shew, 
that at least the differences are sometimes very trifling. Thus, 
the isomorphous sulphates of zinc and of magnesia (Zn -f 
