ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
549 
In the third part the structure of protoplasm is treated of. Therein 
are discussed striation and artificial striation, the central body, the poly- 
morphism and monomorphism of protoplasm. 
(6) Miscellaneous. 
Jordan’s Hew Apparatus for Orienting Small Microscopic 
Objects.* — Dr. Jordan’s embryological researches at the Naples Zoo- 
logical Station impressed upon him the desirability of endeavouring to 
find a means of solving the following problem : — “ How to get objects 
Fig. 138. 
to orientate themselves and assume such a position that they can, with- 
out risk of displacement, be imbedded in paraffin.” His apparatus, 
invented for this purpose, consists in principle of an orienting table 
within a trough, which finally, after the hardening of the imbedding 
material, allows the removal of the paraffin block with the object. A 
Fig. 139. 
V 
V 
• ■ • • 
small rectangular box, whose base is some 20 mm. in perimeter, is per- 
forated with a circular aperture, in which a sphere so fits that slightly 
more than half of it projects into the box. The embryo or other object 
is placed upon this sphere, secured as described later, and oriented by 
means of the handle as desired (fig. 138). In a more complete form, 
* Zeitschr. f. wiss. Mikr., xvi. (1899) pp. 33-7 (2 figs.). 
