730 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



drained on filter paper, placed on a small drop of cement in the centre of 

 a paper disk, and oriented. When in the desired position, some xylol 

 is applied at the joint with a pipette to fix the object. Directions are 

 then given for imbedding in paraffin. 



Apparatus for keeping Celloidin Blocks moist and perforated 

 Capsules for Staining Celloidin Sections.* — Dr. J. J. Stieiff describes 

 a convenient device for keeping celloidin blocks moist. To the piece S 

 (fig. 202) is fixed the plate p by means of four screws. On the plate 

 the object imbedded in celloidin is fixed in the usual way, and a series of 

 ten sections are cut. A glass cylinder, the edge of which is smeared 

 with vaselin, is then placed in the groove rr on the plate. The jar 

 thus made is filled with 80 p.c. alcohol and covered with a lid. In this 

 way the object can be kept moist for a long time. The fluid can be 

 withdrawn rapidly by means of the apparatus shewn in fig. 203, the 

 working of which is self-evident and does not require description. 



Fig. 203. 



For staining and washing the sections, the author uses perforated 

 capsules. These have a diameter of 5 cm., and the sides are 3 cm. high. 

 In the bottom are four holes, 2 mm. wide, and in the sides are two holes 

 near the bottom 2^ mm. wide. The capsules are numbered from 1-10. 

 The idea of these perforated capsules is not new, but they deserve 

 mention on account of the trouble saved. The ten capsules are placed 

 in a large pan containing the staining ox other fluid, which flows in or 

 out according as the capsules are placed in the pan or lifted out there- 

 from. 



* Arch. f. Mikr. Anat. u. Entwick., lvi. (1900) pp. 940-6 (3 figs.). 



