VII. MISCELLANEOUS. 549 



quarter of an inch in diameter, is fitted into the centre of the solid extremity 

 of the larger or outer box about one-eighth of an inch from the centre of the 

 test paper. A small pipe from the solid extremity of the smaller box com- 

 municates with the aspirator. Described at meeting of British Association 

 for Advancement of Science, Birmingham, 1865. 



2549. Drawings (4) of two apparatus for testing the Products 

 of the Perspiration of Animals ; the larger of this apparatus is 

 destined for horses, cattle, swine, and sheep, &c. ; the smaller serves 

 for the same researches on poultry and rabbits, &c. 



Professor Dr. Ignaz Moser, Vienna. 



2550. Frerich's filtering Pump, made of platinum. 



F. Sartorius, Gottingen. 



2551. Frerich's filtering Apparatus, made of gutta 

 percha. F. Sartorius, Gbttingen. 



2552. Frerich's filtering Apparatus, made of porcelain. 



F. Sartorius, Got tin gen. 



2553. Frerich's Apparatus, for determining specific gravi- 

 ties in scientific investigations. F. Sartorius, Gottingen. 



2554. A. Midler's Lixiviating Apparatus, provided with 

 a set of sieves and a second indicator. 



Franz Schmidt and Haensch, Berlin. 



This apparatus is accompanied by a pamphlet descriptive of its 

 application. 



2556. Geissler's Apparatus for determining carbonic acid. 



Ch. F. Geissler $ Son, Berlin. 



2557. Collection of Glass Stop-cocks of various sizes. 



Ch. F. Geissler $ Son, Berlin. 



2558. Apparatus for producing a Vacuum for purposes of 

 Crystallization and Filtration. Hermann Fischer, Hanover. 



2559. Spring- Vacuometer, belonging to the above appa- 

 ratus. Hermann Fischer, Hanover. 



The apparatus, which is principally intended to replace Bunsen's filtering 

 pumps, is constructed on the principle of the injection pump, producing a 

 vacuum by means of a powerful jet of water. The little vacuometer contains 

 a Schinz' tube. If the tube, marked water, be joined to the water supply 

 pipe by means of an india-rubber tube, and the tube which in the drawing is 

 not shown at all be joined to the waste pipe, and connexion be made with 

 the vessel which is to be exhausted, a corresponding vacuum is readily pro- 

 duced. With a fall of water of 1 1 mm. a vacuum will be formed which at 

 most will only fall short by one cm. from the absolute barometric height. If 



