ZOOLOGY AND BOTANY, MICROSCOPY, ETC, 



153 



(4) Other Accessories. 



Super-stag-e for the Selection and Arrangement of Diatoms.*— Herr 

 E. Debes's instrument (figs. 19, 20, and 21) for selecting and arranging 

 diatoms consists of a ring A fixed to the stage of a large Zeiss dissecting 



Fig. 19. 



Fig. 21. 



Microscope and moving pendulum-wise on the axis a. Within the ring 

 is a disc B moving round the middle point h ; the disc is provided with 



* Zeitschr. f. Wiss. Mikr., iii. (1886) pp. 330-6 (3 figs.). 



