An address delivered to the Royal Society of Edinburgh on the 1st December 1862 : containing remarks on the rise and progress of learned societies and on the means of maintaining their usefulness: to which is added a memoir of Louis Albert Necker, late professor of mineralogy in the Academy of Geneva, and honorary member of the Royal Society of Edinburgh /by James David Forbes, LL.D., F.R.S., one of the vice-presidents of the Royal Society of Edinburgh