Cfcftion. 



THE WORKS 



OF 



FRANCIS MAITLAND BALFOUR, 



M.A., LL.D., F.R.S., 



FELLOW OF TRINITY COLLEGE, 



AND PROFESSOR OF ANIMAL MORPHOLOGY IN THE UNIVERSITY OF 



CAMBRIDGE. 



EDITED BY 

 M. FOSTER, F.R.S., 



PROFESSOR OF PHYSIOLOGY IN THE UNIVERSITY OF CAMBRIDGE: 



AND 



ADAM SEDGWICK, M.A., 



FELLOW AND LECTURER OF TRINITY COLLEGE, CAMBRIDGE. 



VOL. IV. 



PLATES. 



MACMILLAN AND CO. 



1885 



