120 T. G. KIXGSFORD, NOTE ON CONSTRUCTING SMALL GLASS TANKS. 



description, containing a solution of acetate of copper, in use as 

 a light filter for nearly two years, and although of very rough 

 construction, it has never developed the slightest defect, notwith- 

 standing the fact that I have frequently had it so near to 

 the lamp that it has become quite hot. 



Journ. Quekett Microscopical Club, Ser. 2, Vol. IX., JVo. 55, November 1904. 



