PLATE 



i 



Fig. 46. 



uij f Messi ck for 



camphine or belmontine. p. 20. 



Sirnplp paraffin** lamp, 

 wit.L round wick p -0 



Hockett lamp, ma." 



with rcuud Tick. p 



Fig. 50. 



Beck's parabolic reflector, with Mr. Sorby' 

 modification, p. 21. 



Gas microscope lamp, wiQi "water tatli. Sec. 

 arranged t.y Mr. Highley. p. 20. 



. 51. 





Bull's-eye condenser for students' microscope, p. jl 



Bull's-eye condenser, on upright stand., p SI. 



[To face page 22. 



