Chemidry. 
chrome should be considered as the most <^onstant ingredient of 
meteoric stones. Journal de Physique^ Avril 1820. tom. xc. 
p. S12. 
22. Muriate of Potash in Rock-Salt — M. Vogel has disco- 
vered that muriate of potash exists in rock-salt, and in com- 
mon salt extracted from brine springs. See Gilberts Annalen^ 
Lxiv. p. 157. 
23. Benzoic Jck/.— M. Vogel has discovered benzoic acid 
in a crystallised state between the skin and the kernel of the 
Tonqum bean (from the Dlpteryx odnrata of Willdenow.) He 
also found this acid in the flowers of the Trifolium melilotus 
officinalis^ in such quantity, that he thinks it might be profitably 
extracted from them for the purposes of sale. See Gilberfs 
Annalen^ lxiv. p. 161. 
III. NATURAL HISTORY. 
MINERALOGY AND GEOLOGY. 
24. New Ores of Lead, — We have stated in an account of 
some new ores of lead, published in last N°; p. 138. that Dr 
Fyfe found one of them to be a sulpho-carhonate of lead, and 
we stated, out of justice to that chemist, that he communicated 
this fact to us on the 6th of March. We understand that Mr 
Brooke’s experiments on “ Three new species of Lead-ore” 
were made in 1819, long before any experiments were made in 
Scotland ; but even if this had not been the case, the single ex- 
periment made by Dr Fyfe could never have been regarded as 
interfering with the right of Mr Brooke to be considered as the 
first who determined these specimens to be new ores. We have 
some reason, however, to think that the ores examined in Edin- 
burgh are not the same as those described by Mr Brooke. — d. b. 
25. Wahlenberg^s Geology This celebrated Swe- 
dish botanist has for some years past devoted his time to the 
study of geognosy ; and in the summer of 1817, he made a geo- 
logical survey of the southern part of Sweden. Lately he has 
published in the Acta Upsalienses, a masterly memoir on the 
petrifactions of Sweden, particularly descriptive of those met 
with in transition rocks. He has also published, as a prodro- 
