XII. MISCELLANEOUS. 1001 



It is necessary for researches on the total exchange of material in an 

 animal to collect completely and separately the faeces and the urine. The 

 stall exhibited serves to illustrate the method in which the experiment was 

 carried out at the Research Station at Gottingen-Weende, when a sheep 

 formed the subject of investigation. The single pen stall was erected in the 

 chamber of Pettenkofer's respiration apparatus on those days when, in addition, 

 the products of respiration were determined. 



See Neue Beitrage zur Begriindung einer rationellen Fiitterung der 

 Wiederkauer, edited by Henueberg, Gottingen, 1870-71. 



3940. Mercurial Air Pump, for the analysis of blood-gases. 



Ch. F. Geissler $ Son, Berlin. 



The taps of the air pumps and other apparatus must be turned gently 

 after they have been smeared slightly with lard until they appear transparent 

 and clear. 



3941. Sample Collection of Sections of Wood. 



Dr. H. Nordlinger, Hohenheim, Wurttemberg. 



The volume, which is the seventh published, contains, as well as the six 

 preceding, 100 species of woods botanically determined. Although following 

 as far as possible the Linnaean nomenclature, it introduces, however, about 50 

 new genera. It gives also an extraordinary variety of the inner structures of 

 trees. There are specimens amongst them of the Suasda of the Mediterranean, 

 and Atherstonia of the Cape, which can, on account of their abnormal struc- 

 ture, be only classified with difficulty. 



Especially interesting is the comparison of the species of different genera of 

 woods coming from different climates. 



3942. Lucre's Drawing Apparatus, modified by Spengel. 



A- Wichmann, Hamburg. 



3943. Orthoscope. A. Wichmann, Hamburg. 



3944. Two Large Sachs' Vegetation Flasks, for coloured 

 light, 500 mm. high, and 250 mm. across. 



Warmbrunn, Quilitz, $ Co., Berlin. 



3945. Two Smallar Flasks, entirely of glass. 



Warmbrunn, Quilitz, $ Co., Berlin. 



3946. Kronecker's Warm Chamber for Digestion. 



Warmbrunn, Quilitz, $ Co., Berlin. 



3947. Ludwig's Strom iihr or Hsemodromometer. 



T. Hawksley. 



3949. Set of Physiological Operating Instruments. 



T. Hawksley. 



3949a. Table, with 



(a.) Fifteen pieces of the original burners which Middeldorpf, 

 the discoverer of galvano-caustic, employed. 



(.) Collection of nine different uterus cauterizers. Wen con- 

 strictor. Bow cutter, with five adaptable tubes. Appliance for 

 cauterizing the almond glands. Sliding corrector. 



