Dr. Mac Culloch on Mineral Veins. 209 



origin, is only one out of the numerous difBculties that beset 

 this subject. These are, in fact, such, and so apparently insur- 

 mountable at present, that a prudent geologist can do no 

 better than suspend his judgment on the subject; provided he 

 does not also suspend his investigations. Both the theories 

 are before him, and he ought to try the facts by both, not by 

 one only, to the exclusion of the other. In this pursuit, he 

 ought to take into his views tie formation of minerals by sub- 

 limation, and their production from infiltration ; tv^o pro- 

 cesses which have been neglected by former theorists. Not, 

 however, that these will, on either side, form in themselves a 

 theory ; because even were there not many more unintelligible 

 circumstances in veins, we are still unable to explain whence, 

 on either hypothesis, the minerals have arrived at their present 

 places. J. Mac Culloch. 



Art. III. Description of the Great Bandana Gallery, in 

 the Turkey Red Factory 0/ Messrs. Monteith and Co., 

 at Glasgow. 

 Tub benefits of liberal-mindeduess are nowhere more fully 

 displayed than in the modern advancement of our chemical 

 arts. A quarter of a century ago, manufacturing chemists were 

 ■wont to shroud their operations in mysterious S'^crecy, like the 

 craftsmen of the dark ages, on a supposition, usually un- 

 founded, of their being possessed of some wonder-working 

 recipes, whose promulgation would be fatal to their interests. 

 At that period, the monied proprietors of chemical factories 

 were rarely practical chemists. They were, therefore, obliged 

 to place entire dependance in certain operative adepts, whom they 

 engaged at a considerable salary, to conduct their processes. 

 These persons, having been previously employed as subordinate 

 menials in soiue similar manufactory, had acquired a smattering 

 notion of the routine of working: but, being entirely destitute 

 of education, and having no general views concerning the 

 liuainess which they undertook tp manage, they were perpe-, 

 P 2 



