ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



233 



arm e, and the toothed segment d. By means of the excentrically 

 applied lever the circular movement of the segment d is converted into 

 an up-and-down movement, which afterwards causes the forward and 

 backward rotation of the wheel i, and finally the forward and backward 

 gliding of the knife. The connection of d and e is adjustable and can 

 be regulated in such a way that the knife movement may extend over 

 the whole, or part, of the slide-range. The author considers that the 

 operator will find it an advantage to be able to rotate the wheel H as 

 he pleases, and that the application of motor-gear to the microtome will 

 be facilitated. 



New Method of Imbedding Small Objects.* — G. Lefevre has 

 devised a glass dish in which small objects, e.g. Echinoderm eggs, &c. 

 may be imbedded with great ease, and which prevents them from 



Fig. 48. 



scattering 



The dish is a flat solid watch-glass with a shallow con- 

 cavity, in the bottom of which is moulded a narrow slot-like groove or 

 trough (fig. 48). The dish is 40 mm. square and 9 mm. high ; the 



Fir. 4D. 



Fig. 50. 



Fig. 51. 



diameter of the concavity is 34 mm. and its greatest depth 4.^ mm. 

 The groove, which is slightly bevelled at the ends, is 11 mm. longat 

 the bottom, 2 mm. wide, and 2 mm. deep. Fig. 49 shows a section 



* Journ. App. Micr., v. (1902) pp. 2080-1 (5 figs.). 



