476 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



travelling purposes, as it takes asunder so as to fit into a comparatively 

 small case (fig. 72). The case serves as a foot for the Microscope, 

 which is provided with a conical pin fitting into a bush in the lid of the 

 case. The stage is provided with a wheel diaphragm, and the upper 

 part of the case is made to slide so as to reduce the size of the case. 



Fig. 72. 



Recent Improvements in Leitz Microscope Stands.* — Carl Metz 

 discusses several improvements which E. Leitz has applied to Micro- 

 scopes, designed for the more refined requirements of medical and 

 botanical research. 



Stand lib, which is still the simplest available for the purposes of 

 bacteriologists, was introduced in 181)5, and has recently been improved, 

 the tripod having been replaced by a more graceful and rigid foot of the 

 horseshoe type (fig. 73). This instrument, besides forming an excellent 

 student's Microscope, has frequently enabled those engaged in research 

 to procure a suitable ]\Iicroscope in cases where the means for a larger 

 and costlier stand were not available. 



The new stands (fig. 74), C, D, and F, differ from the older type 

 mainly by the application of a micrometer screw of a new form. The 

 screw is attached to the body of the Microscope immediately behind the 

 tube, and transmits its motion to a slide carrying the tube. The new 

 micrometer movement met with so much favour that the original inten- 



Zeitschr. wiss. Mikrosk., xxiii. (1906) pp. 430-9 (5 figs,). 



