COURSE OF LECTURES 



ON 



NATURAL PHILOSOPHY 



AND THE 



MECHANICAL ARTS. 



BY THOMAS YOUNG, M.D. 



A NEW EDITION, WITH REFERENCES AND NOTES, 



BY THE 



REV. P. KELLAND, M.A., F.R.S., LOND. & EDINB., 



J, ETC. IN THI 



fcp ftumerous (Engrabings on 



IN TWO VOLUMES. 

 VOLUME I. - TEXT. 



. 4! >. ' 



r 



LONDON: 

 PRINTED FOR TAYLOR AND WALTON, 



UPPER GOWER STREET. 

 1845. 



