[ viii ] 
XX. On the Arrangement of the Foliation and Cleavage of the Rocks of the North of 
Scotland. Bij Daniel Sharpe, F.R.S., V.P.G.S page 445 
XXI. On the Change of Refrangihilitij of Light. By G. G. Stokes, M.A., F.R.S., 
Fellow of Pembroke College, and Lucasian Professor of Mathematics in the 
University of Cambridge 463 
XXII. The Reproduction o/' ^//,e Ascaris mystax. Henry Nelson, A/.Z>. Com- 
municated by Allen Thomson, M.D., F.R.S., Professor of Anatomy in the 
University of Glasgow 563 
XXIII. On the Blood-Proper and Chylaqueous Fluid of Invertebrate Animals. 
By Thomas Williams, M.D. Land., Extra Licentiate of the Royal College of 
Physicians, and formerly Demonstrator on Structural Anatomy at Guys 
Hospital. Communicated by Thomas Bell, Sec. R.S 595 
Index 655 
Appendix. 
Presents 
[ 1 ] 
