b 2 
ADVEETISEMENT. 
nnHE present volume contains 33 papers numbered. 384 to 416 published 
for the most part in the years 1865 to 1872; the last paper 416, 
of the year 1882, is inserted in the present volume on account of its 
immediate connexion with the papers 411 and 415 on Reciprocal Sur 
faces. 
The Table for the six volumes is 
Vol. I. 
Numbers 
1 
to 
100. 
„ II. 
11 
101 
J) 
158. 
„ HI- 
11 
159 
1) 
222. 
t> 
i—i 
11 
223 
299. 
„ v. 
11 
300 
383. 
VI. 
) } 
384 
11 
416,