294 



the Indians, and he was suffered to depart in peace. These, Dr E. 

 thinks, may have been descendants of Madocs folloivers ; and he 

 seems inclined to ascribe to them also those very remarkable mounds, 

 fortifications, and enclosures, which are found in such quantity in the 

 valleys of the Mississippi and the Ohio. He is inclined also to trace 

 to these Welsh adventurers, or at least to some early Europeans, the 

 now almost extinct tribe, the Mandans — a people fairer and hand- 

 somer than the Red men, — that are now found 1800 miles above St 

 Louis, on the Missouri, as described by Lewis and Clarke, and Cat- 

 lin, the American travellers. 



These, and several other circumstances, which might have been 

 adduced, prove that Columbus cannot be regarded as the original 

 discoverer of the New World. 



The following Donations to the Library were announced : 



Philosophical Transactions of the Royal Society of London, 1849. 



Part II. 4to. — By the Society. 

 Kongl. Vetenskaps. Akademiens Handlingar, f(5r 1 847 & 1848. 8vo. 



o 



Arsberattelser om Botaniske Arbeten och Uptackter for 1843 & 

 1844. 8vo. 



O o 



Arsberattelse om Framstegen i Kemi under Ar. 1847. 8vo. 



o 



Arsberattelse om Technologiens Framsteg. 1842, 1843, 1844, 



1846. 8vo. 

 Ofversigt af Kongl. Vetenskaps. Akademiens Forhandlingar. 1848. 



8vo. — By the Academy. 



Monday, \^th February 1850. 



The Right Rev. BISHOP TERROT, V.P., in the Chair. 

 The following Communications were read : — 



1. On the Equilibrium of Elastic Solids. By James Clerk 

 Maxwell, Esq. Communicated by the Secretary. 



This paper commenced by pointing out the insufficiency of all 

 theories of elastic solids, in which the equations do not contain two 



