ADVEBTISEMENT. 
rjlHE present volume contains 84 papers numbered 300 to 383 published 
for the most part in the years 1861 to 1866: No. 378, Report 
on Catalogue of Philosophical Memoirs, was however published in the 
British Association Report for 1856, and No. 379, Notices of Communi 
cations to the British Association, were published in the British Association 
Reports, 1854 to 1864: the concluding Paper 383, Problems and Solutions, 
contains problems for the most part geometrical ones proposed or solved by 
me in the Educational Times in the years 1863 to 1865. 
The Table for the five volumes is 
Yol. I. 
Numbers 
1 
to 
100. 
HH 
1—1 
33 
101 
33 
158. 
„ III. 
33 
159 
33 
222. 
„ IV. 
33 
223 
33 
299. 
„ V. 
33 
300 
33 
383.