DUBLIN UNIVERSITY PRESS SERIES. 



THE COLLECTED WORKS 



OF 



JAMES MAC CULLAGH, LLD. 



FELLOW OF TRINITY COLLEGE, 

 AND 



PROFESSOR OF NATURAL PHILOSOPHY IN THE UNIVERSITY OF DUBLIN. 



EDITED BY 



JOHN H. JELLETT, B.D., 



AND 



SAMUEL HAUGHTON, CLK., M.D. 



DUBLIN: HODGES, FIGGIS, & CO., GRAFTON-STREET. 

 LONDON : LONGMANS, GREEN, & CO., PATERNOSTER-ROW 



i860. 



