Oclobcr jist, iSgQ.] Pr0CI':p:I)INCS. iii 



Dr. 1''. II. liouMAN and Mr. W. H. Johnson staled that 

 llicy had seen Uic cxi)erinient performed. 



Mr. Thomas Thori' read a jjapcr on "Diffraction Grating 

 Films and their Application to Colour Photography," 

 and exhibited an apparatus wliieh showed pliotographs of objects 

 in their natural colours by the aid of gratings, and without the 

 use of pigments or dyes. 



Dr. (Charles H. Lkes read a paper entitled: "On the 

 Electrical Resistance between Opposite Sides of a 

 Quadrilateral, one diameter of which bisects the other 

 at right angles." 



The paper is published in full in the Memoirs. 



General Meeting, October 31st, 1899. 



Horace Lamc, M.A., F.R.S., President, in the Chair. 



Mr. Jocelyn F. Thorpe, Ph.D , Demonstrator and Assistant 

 Lecturer in Organic Chemistry, Owens College, was elected an 

 ordinary member. 



Ordinary Meeting, October 31st, 1899. 

 Horace Laimb, M.A., F. R.S., President, in the Chair. 



The thanks of the members were voted to the donors of the 

 books upon the table. 



Dr. G. H. Bkoadbknt introduced the subject of the well at 

 Giggleswick, known for the ebb and flow of its water, and asked 

 whether an explanation ot what is locally known as the "silver 

 thread " could be offered by any member. The well consists of 

 a stone cistern, at the top and back of which the water enters 

 from the Giggleswick Scars, there being two small outlets about 

 half-way down each side of the tank and opposite each other. 



