5jf sqi. 



THE PRINCIPLE OF 



LEAST ACTION IN NATURE, 



ILLUSTRATED BY 



ANIMAL MECHANICS. 



BEING 



THREE LECTURES, 



DELIVERED AT THE ROYAL INSTITUTION OF GREAT BRITAIN. 



BY THE 



REV. SAMUEL HAUGHTON, M.D.DubL, D.C.L.Oxon., F.KS., 



Fellow of Trinity College, Dublin. 



LONDON: 



) 



MDCCCLXXI. 



