Chemistry and Physics. 277 
» Quinine, citrate of. Cer 
ium, oxyd of. 
c Parmeline, 
Veratric acid. Lecanorine. 
Esculine. Indigo red. 
Theine. : Ammonia, oxalate of. 
Silver, cyanid of. ms sulphate of. 
(74 
acetate Soda, chromate of. 
Platina and magnesia,cyanuretof.| Lead, iodid of. 
‘* and 
barytes, cyanuret of. Strychnine, sulphate of. 
** potassium, cyanuret of. e acetate. of. 
‘* ammonia, chlorid of. Soda, native nitrate of. 
Potash, oxymuriate of. ~ Berberine 
‘** chroma ‘ Mucic acid. 
Urea, nitrate of. Solanine. 
Asparagine. 
hor. Mercury, oxymuriate of. 
Cinchonine. Isatine. 
* sulphate of. Alizarine. 
Meconic acid. Manganese, sesquioxyd of. 
Brucine, sulphate of. Lead, protoxyd of. 
Morphia, acetate of. Tungstic acid. 
Tin, iodid of. Chromo-oxalate of potash. 
In submitting other crystals to the influence of com| ression and 
traction, I have found great numbers which do not exhibit the least 
ydrate of potash, pure. Soda, acetate of. 
lndigotie acid. ercury, prussiate of. 
Urea. - muri 
Citric acid. * ~— sulphuret of. 
Silver, nitrate of. . Barytes, acetate of. 
onine, Zinc, chromate of. 
Naphthaline. “© sulph 
Soda, nitrate of. Cobalt, sulphate of. 
Potash and copper, sulphate of. Magnesia and soda, sulphate of. 
Soda, phosphate of. Borax. 
As both compression and traction are necessary in producing the 
transparent ideaua and lines in both classes of the substances I have 
