Proceedings. 215 



Ordinary Meeting, March 19th, 1889. 



Professor OsBORNE Reynolds, M.A., LL.D., F.R.S., 

 President, in the Chair. 



Dr. Charles Clay read a paper " On the resuhs of 

 some calculations with a certain class of figures " embody- 

 ing some arithmetical calculations bearing on the problem 

 of the squaring of the circle. 



Mr. W.M. Thomson, I^R.S.Ed., read a paper " On the 

 presence of green colouring matter in leaves found about 

 21 feet under the surface in an excavation connected with 

 the Ship Canal Works," and exhibited specimens of the 

 deposit. 



Dr. Hodgkinson read the second of a series of papers 

 *' On Colour and its relation to the Structure of Coloured 

 Bodies ; being an Investigation into the Physical cause of 

 Colour in natural and artificial bodies and the Nature of 

 the Structure producing it," treating of some of the physio- 

 logical phenomena of colour sensation. 



