J 22 yln Address to Chemists. [Feb, 



At the old silver mine at Alva, in Clackmananshire, cobalt crust 

 occurs in the cavities of heavy spar associated with native silver. The 

 vein is situated in trap rocks, v.hich are included in the old red 

 sand-stove.^ 1 have heard that the ores of cobalt occur in other 

 parts of Scotland ; but at present I am ignorant of the nature of 

 the rocks in which they have been found. 



I regret that these notices are so imperfect and unsatisfactory in 

 those particulars which have a reference to the nature of the vein. 

 But as they establish the existence of the ores of nickel and cobalt 

 as inmates of tlie Independent Coal Formation, I have ventured to 

 communicate thorn to your readers. 



Mame of Flisk, Fifeshire, 

 Not:. 12, 1814. 



Article X. 



jin Address to those Chemists ivho wish to examine the Laws oj 

 Chemical Proportions, and the Theory of' Chemistry in general. 

 By Jacob Berzelius, M. D, F.R.S. Professor of Chemistry in 

 Stockholm. 



Mr. Dalton has published in the Annals of Philosophy, vo\. iii. 

 p. 174, Observations concerning my memoir On the Cause of Che- 

 mical Proportions. It has given me pain to think that the respect- 

 able Dalton has taken my ideas on the corpuscular theory as a 

 criticism on his, between which he has pointed out the difference. 

 I think 1 have expressed myself in that memoir with sufficient pre- 

 cision to make the reader sensible that I neither meant to give the 

 opinions of Dalton, nor a correction of them. There is a very 

 essential difference between the researches of Mr. Dalton and 

 myself. Mr. Dalton has chosen the method of an inventor, by 

 setting out from a first principle, from which he endeavours to 

 deduce the experimental results. For my own part, I have been 

 obliged to take the road of an ordinary man, collecting together a 

 number of expeiiments, from which 1 have endeavoured to draw 

 conclusions more and more general. 1 have endeavoured to mount 

 from experiment towards the first principle; while Mr. Dalton 

 descends' from that principle to experiment. It is certainly a great 

 homage to the speculations of Dalton if we meet each other on the 



road. 



Amono- the numerous experiments which I have myself made 

 relative to this subject, there are some which do not appear to agree 



* 1 have reason to conclude, from observations which 1 matle this smniner, that 

 the Cdimlrv between the I.nmonds on the soiith, and Stonehaven on the norlh, 

 inclading the Oihil', artd the hills in tlie neiglibonrhood of Perth, Dundee. Red- 

 head, and Mnntrose, is composed of rocks belonging to the old red sai.d-stonc. 

 Upon the southern exlrrmity of the>e rocks the great coal-field of the Forth rests, 

 and occuiiies the Bilualion of a newer deposition. 



