220 • SUMMARY OF CURRENT RESEARCHES RELATING TO 



MICROSCOPY. 



A. Instruments, Accessories, &c.» 

 (1) Stands. 



. New 'Arrangement for avoiding Injury to Preparations when 

 Focussing with High Powers.f — A. Bourguet's contrivance for this 



Fig. 37. 



Fig. 38. 



purpose consists of a special tube-funnel and a stop for limiting the 

 descent of the Microscope-tube. The funnel (entonnoir) is that upper 

 part of the objective-mount which does not contain a lens, and is here 



* This subdivision contains (1) Stands; (2) Eye-pieces and Objectives; (3) Illu- 

 minating and other Apparatus; (4) Photomicrograpby ; (5) Microscopical Optics 

 and Manipulation; (6) Miscellaneous. 



t Zeitschr. f. wiss. Mikr., xix. (1902) pp. 35-40 (2 figs.). 



