Proceedings. 31 



Ordinary Meeting, October 29th, 1895. 

 Henry Wilde, F.R.S., President, in the Chair. 



The thanks of the members were voted to the donors 

 of the books upon the table. 



Mr. F. Nicholson, F.Z.S., called attention to a recent 

 discussion on the alleged difficulty of growing thistles from 

 seed, and suggested that the explanation was that the seed 

 of the thistle does not fertilise until its second year. 



Mr. Alfred Brothers, F.R.A.S., exhibited some 

 prints produced in two colours, red and blue, the two 

 superposed impressions having, apparently, been slightly 

 displaced in the successive printings, with the result that, 

 when viewed through a pair of spectacles having a red 

 glass for one eye and a blue glass for the other, the images 

 were made to coalesce, and a stereoscopic effect was 

 produced. A discussion ensued, in which Dr. Schuster, 

 Professor H. Lamb, M.A., F.R.S., and Mr. C. H. Lees, 

 D.Sc, took part, as to whether two different images were 

 superposed in the printing or the effect was produced by 

 the same image superposed in two colours and slightly 

 displaced. Examples of photographic printing in three 

 colours were also exhibited and described. 



A paper by Mr. J. A. Harker, D.Sc, on "An Experi- 

 mental Determination of the Latent Heat of Water," 

 was communicated by Professor Schuster, F.R.S. The 

 experiments, which were in continuation of previous 

 experiments but with improved apparatus, confirmed 

 Regnault's determination. 



