70 Proceedings. 



{^Microscopical and Natural History Section?^ 



Ordinary Meeting, December 17th, 1888. 



Mr. J. Cosmo Melvill, M.A., President of the Section, 

 in the Chair. 



Dr. Alex. HodgkinsoN exhibited under the micros- 

 cope, crystals of chlorate of potash, showing iridescent 

 colours, and explained the cause of these colours. 



Mr. Stirrup exhibited a fruit of a silver fir, Abies 

 Douglasii, from Sir U. Kay Shuttleworth's estate in North 

 Lancashire. 



Mr. P. Cameron made a communication on Pj'ret/nmn, 

 and its use as an insecticide ; describing its cultivation in 

 California, and its manner of use in America. 



