LECTURES TO THE OPERATIVE CLASSES. 
ixxxi 
Date and Place Lecturer . Subject of Discourse 
1890. Leeds ...... Prof. J. Perry, D.Sc., F.R.S. | Spinning Tops. 
1891. Cardiff...... ‘Prof. 8. P. Thompson, F.R.S. | Electricity in Mining. 
1892. Edinburgh | Prof. C. Vernon Boys, F.R.S.| Electric Spark Photographs. 
1893. Nottingham Prof. Vivian B. Lewes......... |\Spontaneous Combustion, 
1894. Oxford...... |Prof. W. J. Sollas, F.R.S. ...|Geologies and Deluges. 
1895. Ipswich ...)Dr. A. H. Fison..........0008 os |Colour, 
1896. Liverpool...| Prof. J. A. Fleming, F.R.8..../The Earth a Great Magnet. 
1897. Toronto .-| Dr. H. O. Forbes ......s000-.4+5 ,..|New Guinea. 
1898. Bristol......| Prof. E. B. Poulton, F. RS. The ways in which Animals Warn 
their enemies and Signal to their 
| friends. 
1900. Bradford ...| Prof. 8. P. Thompson, ¥.R.S. Electricity in the Industries, 
1901. Glasgow ...|H. J. Mackinder, M.A.......... |The Movements of Men by Land 
| and Sea. 
1902. Belfast ... Prof. L. C. Miall, F.R.S. ......!Gnats and Mosquitoes. 
1903, Southport |Dr.J. 8. Flett wc... eee! Martinique and St. Vincent: the 
Eruptions of 1902. 
1904, Cambridge |Dr. J. E. Marr, F.R.S. .........;The Forms of Mountains. 
1904. 
