136 QUARTERLY CHRONICLE. 
pyramid, whose base was a fattened rhombus. Some which 
appeared to be incompletely formed represented merely a 
four-sided pyramid with a rounded base. The length of the 
perfect crystals varied between 0°016 and 0-075, and the 
angles of the optical longitudinal section were between 18° 
and 162°. The crystals were insoluble in cold water; in 
boiling water they disappeared, but whether by solution or 
disintegration the author could not decide, but is inclined to 
think the latter, as he never observed any recrystallization 
on cooling. Neither alcohol, ether, chloroform, nor glycerine, 
even after long exposure, had any effect upon them. Acetic, 
tartaric, and phosphoric acids slowly dissolved them, as did 
also very weak solutions of soda and potass. ‘The action of 
the mineral acids was peculiar; hydrochloric and nitric acid 
in strong solutions dissolved the crystals, which withstood 
the same acids in the concentrated form, in which, however, 
they became apparently softened, and were usually bent into 
an § form, or became crescentic. Strong sulphuric acid de- 
stroyed the crystals, which remained unaltered only in a 
moderately weak solution. Ammonia dissolved the crystals 
very slowly ; they were unaffected by the putrefaction of the 
blood even after several weeks. Prof. Neumann is unable 
to give any opinion as to the chemical nature of these 
crystals, and goes on to cite other instances in which appa- 
rently similar products were met with. These are—(l) one 
mentioned by Magitot and Charcot in the ‘ Gazette hebdo- 
madaire,’ 1860, No. 47, also in a leuceemic individual; (2) a 
case by Robin and Charcot; (8) E. Wagner (‘ Archiv d. 
Heilkunde,’ 11, p. 379); (4) several cases of apparently 
similar crystals in the, sputa, by Forster (‘ Atlas d. path. 
Anat.,’ taf. xxxii, fig. 4; and by Friedreich (‘ Virchow’s 
Archiv,’ xxx, p. 382), who regarded them as “ tyrosin,” 
but evidently erroneously. 
2. * On Corpora Amylacea in the Gali-bladder.’’—These 
bodies were found in great numbers in the viscid mucus 
lining the walls of a gall-bladder, in which were contained 
numerous gall-stones. The largest measured no more than 
0028 mm. in diameter, and most were not more than half 
that size. Some were round, others egg-shaped; whilst 
some were tri- or quadrangular, with the angles rounded off. 
All presented a very distinct concentric lamination, the 
number of laminz being usually in proportion to the size of 
the body ; and in the centre of the larger ones was a distinct 
though small cavity, from which fissures radiated towards 
the periphery. The corpuscles all had a shining fatty 
aspect, and bright yellow colour. A watery solution of iodine 
