[ V ] 
XVIII. On a New Series of Bodies in which Nitrogen is substituted for Hydrogen. By 
Peter Griess, Esq. Communicated by A. W. Hofmann .... page 667 
XIX. On the Differential Equations which determine the form of the Boots of Algebraic 
Equations. By George Boole, F.B.S . , Professor of Mathematics in Queens Col- 
lege , , Cork . ' 733 
Index 757 
Presents 
Appendix. 
[ 1 ] 
