ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



241 



of its chief features is an obvious and convenient handle, a most useful 

 adjunct to an instrument intended for elementary microscopists who are 

 prone to lift the stand by its fine-adjustment. The instrument is 

 supplied with rack-and-pinion coarse-adjustment, and a micrometer 

 movement fine adjustment. The fixed stage is circular, and of large 

 dimensions (If inch diameter), but this may be easily removed and 

 replaced by a rotating stage, provided with a scale of degrees whenever 

 polarised light is required. The usual accessory substage fittings and 



Fig. :->t3. 



apparatus are supplied. Their addition adds somewhat to the cost, but 

 materially increases the effectiveness of the instrument. 



Reichert's New Large Stand, A 1, with Extra Wide Tube and New 

 Lateral Micrometer-screw.* — In this instrument (fig. 87) the body- 

 tube projects specially far over the stage, and permits of the examination 

 of large plate preparations or Petri's dishes. The pillar can be used 

 as a handle without danger of disturbing the fine-adjustment. The 

 circular rotating stage can be centred by means of the screws c c', which 

 also provide a small lateral movement.- Larger movements up to 

 100 mm. may be obtained by means of a new mechanical stage, which 



* C. Keichert (Vienna), Catalogue No. 25 (Mikroscopie, 1904) pp. 14-15. 



