22 



PRACTICAL HISTOLOGY. 



Welsbach gas-burner, the rays being transmitted through a large 

 globe containing a dilute blue-coloured solution of ammonio-sulphate 



FIG. 24. Dissecting Microscope by Verick. 



of copper. The lamp recently constructed by Kochs-Wolz of Bonn 

 consists of a petroleum or gas flame, covered by an opaque chimney 



FlO. 25. Dissecting Microscope by Reichert. 



provided with a reflector, which directs the rays of light through a 

 hole in the chimney. Into the hole in the chimney is fitted a glass 



