VIJ. MISCELLANEOUS. 555 



A description of this apparatus will be found in Mitscherlich's papers, 

 entitled " Chemische Abhandlungen," published by E. S. Mittler and Son, 

 Berlin, 1859-65. 



2588. Diagram, showing elevation, section, and plan of a 

 " digestorium " (iron closet constructed for effecting dangerous 

 digesting operations). 



Chemical Institute of the University of Strassburg, in 

 Elsass. 



2589. Mica-plates used for effecting fusions and for evapo- 

 rations (see Mineralogy). Max. Raphael, Breslau. 



Mica is not affected by most acids. This material may also be employed as 

 a cheap substitute for platinum in many chemical operations, 



2590. Mica Powder, for use in filtration*. 



Max. Raphael, Breslau* 



2591. Mica-spectacles, for use in laboratories, to protect the 

 eyes in all operations when dangers from spitting or from explo- 

 sions have to be guarded against. Max. Raphael, Breslau. 



2592. Self-filling Burette, used for oxidizable liquids, toge- 

 ther with filling bottle', wash-bottle, stand, and india-rubber tubes. 



Berggewerkschaftskasse, Bochum, Rhenish Prussia. 



The working of this burette is described in Fresenius' Zeitschr. f. anal. Chem, 

 XIV., 3 and 4. 



2593. Stand provided with pincers and air bath. 



Ball t Freiburg, Baden. 



2594. Ozone'generating Tube, provided with drying appa- 

 ratus. C. Kramer, Freiburg, Baden. 



2595. Heat Regulator. C. Kramer, Freiburg, Baden. 



2596. High-pressure Steam-boiler, together with a dis- 

 tilling and condensing apparatus, as well as a drying closet, 

 capable of being heated by steam. Johann Lentz, Berlin. 



The apparatus is heated by 10 Bunsen burners ; when steam is once got 

 up only half the number is required to keep it up ; the other half may then be 

 turned off. 



The three openings in the apparatus for evaporations are separated from 

 the steam chamber by copper casings, and the steam is let into the latter when 

 required for use by means of small valves. It is thus possible to maintain a 

 certain pressure of steam in the boiler, which is of especial importance when 

 steam has to be used for distillations and for conducting to a distance, as, for 

 instance, in the heating of distant drying-closets. 



2597. Dittrich's Apparatus for the Volumetric Determi- 

 nation of Gases, accompanied by a printed description, together 

 with a drawing and 5 tables. F. H. Buckler, Breslau. 



