i190 = ss Influence of. Prassic acid upon vegelativi. 
dried and heated the light was much more vivid and the coloar 
alittle reddish. It gave out slight scintillations. The gum 
ater was more Juminous than sugar, and even emitted 
light by friction in water.. When these three gums were 
treated with dilute Sulphuric acid, they were phosphorescent 
in the same sparen Bee the Journal de vas April 
1824, p. 193. —Ibid ; 
31. Minerals produced»by heat.—It has besa very often ob- 
served, that the analyses of minerals are. of comparatively 
little valie, as long as we are not eapatie of reproducing b 
composition what had been dissolved. Professor Mistcher- 
lich 1s accomplished this important object. We have —_ 
tified by the sight of beautiful and well defined crystals of 
grayish-white pyroxene, which had been obtained by mixing 
the constituent parts indicated by analysis in the necessary 
portion, and exposing this mixture to the high degree of 
heat of the porcelain furnaces of Seires. By this means 
Professor Mistcherlich has eae in obtaining several spe- 
cies that occur in nature. He has likewise snd “ie 
the different kinds of slags more than forty species in a erys- 
peeve state, particularly of such minerals as are found in 
sie ; tive rocks, but likewise a good’ many others which have 
ov bed! hitherto observed. We propose giving in our next 
nibek a full statement of the further details of these most 
important experiments.—TIbid. 
2. Ammonia disengaged from plants during vegetation.— 
M. *Giouter has determined the very curious fact, that the 
Chenopodium vulvaria spontaneously disengages ammonia if 
a very free state during the act of vegetation ; and he has al- 
so found in conjunction with M. Boullay, that a great number 
of flowers, even among those that have a very agreeable odour 
ontaneously disengage ammonia during vegetation. M. 
Ch hevalier likewise obtained ammonia from the Chenopodium 
vulvaria by aru spe the Journal de Pharmacie, 
Feb, 1824, p. 100.)—Jbi 
33. Influence of prussic acid upon vegetation. —M. C. “ H. 
Becker in his “‘ dissertatio de Acidi Hydrocyanici vi perniciosa 
in plantas”, which appeared at Jena in 1823, in 4to. bas per- 
