93 



This stage consists of a glass box made by the LEYBOLD sealing process, which 

 may be directly used as an object-carrier. A thermometer and inlet and outlet 

 tubes for heated water are fitted at the side of the glass box. In order that 

 this stage may also be available for hanging-drop observations, we supply the 

 same, if so ordered, with three concavities, ground out of the upper glass surface, 

 upon which the cover-glasses are placed. 



No. 216. ZOTH'S Cooling Trough, which is more especially designed 

 for purposes of micro-projection, may also be fitted with a thermometer and 

 will in this form be found to serve as a useful heating stage. 



Other accessory flpplianees. 



Xo. 217. MALTWOOD'S Finder. This simple contrivance for re-finding 

 certain points of an object consists principally of a net-work of separately num- 

 bered small squares photographed upon glass. (See Zeitschr. f. wiss. Mikrosk. 

 vol. V, 1888, p. 40.) 



No. 218. BORN and PETER'S Orientation Plate, constructed by us at 



the suggestion of the gentlemen after whom it is named, serves to mark the 

 position of objects contained in hardening paraffin and at the same time to 

 impress the lines of direction upon the paraffin blocks. For the latter purpose 

 one side of the plate has several parallel grooves, of equal width and with sharp 

 edges, cut into it. (See Zeitschr. f. wiss. Mikrosk., vol. XV, 1898, pp. 31 49.) 



We generally supply a pair of glass set-squares, No. 219, together with the 

 instrument. 



No. 220. Turn-Table (Tournette), on wood base, for ringing specimens. 



, Sena. 



