43i 



different in kind, generated by different causes, propagated by diffe- 

 rent laws, and exhibiting different phenomena. These had not hi- 

 therto been sufficiently distinguished, and some of them were scarce- 

 ly known. The following table exhibits the classification resulting 

 from these investigations : — 



Waves are of four Orders. 



The rest of the paper consisted of the examination of the pro- 

 perties, and an explanation of the phenomena, of these four orders of 

 waves. 



The following Books, presented to the Library of the Royal 

 Society of Edinburgh, were laid on the table — 



Transactions of the Geological Society. (Second Series.) Vol. VI. 



Part 2. — By the Society. 

 Archives du Museum d'Histoiro NatureUe, publiees par Ics Profes- 



seurs-Administrateurs de cet Etablissement. Tome iii. Livr°= 



1, 2. — By the Editors. 



The following Donations to the Museum were announced — 



A Head of Boodhoo in Dolomite from Ceylon, — By Dr Davy. 



Specimens of Coal from Penteraclea, the Ancient Heraclea, on the 

 Blaok Sea. — By the Same, 



Specimen of " Burn Trout."' Sahno Fario, taken from the Com- 

 pensation Pond, weighing 6 lb. — By James Miller, Esq. 



A Specimen of Chalcedony, from Iceland. — By Sir G. S. Mackenzv;. 



