ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



545 



with its revolving diaphragm, swings round for facility in packing, and 

 the base is made folding for the same purpose. It is packed in a 

 morocco-covered case, measuring 8 by 2f by 2^ in. 



New Double-hinged Limb-holder.* — Messrs. Leitz have made for 

 M. P. Porsild a double-hinged limb, so that their preparation Micro- 

 scope may be used for several other purposes. The upper part of the 

 limb (fig. 127) is of the usual character, but is raised and lowered by rack- 

 and-pinion operated by the milled heads shown below the stage. Near 



* Zeitschr. f. wiss. Mikr., six. (1902) pp. 4M (2 figs.). 



