102 



SUMMAEY OF CUKKENT KESEAKCHES UELATING TO 



form of the complete circumference of the upper plate, but the ends 

 terminate in perforated flanges clamped by a screw K ; the remainder of 

 the design is as before. 



Fig. 22. 



Application of the Nernst Incandescent Light to Biological 

 Laboratories.! — A. Greil, in his experiments to find the most suitable 

 form of hght-sonrce for use with projection-drawing apparatus, obtained 

 the best results with a special form of Nernst lamp. The usual three 

 incandescent strands he rearranges in a six-pointed star, tlie ends of the 

 rays being inserted in correspondingly formed bearers through which 



* Zeitschr. wiss. Mikrosk., xxiii. (190G) pp. 257-86 (17 figs). 



