APPENDIX. 391 



THERMOMETRIC SCALES. 



Fahrenheit scale, freezing point of water 32°, boiling point 212* 

 Reaumur ,, ,, ,, „ 0° „ „ So* 



Centigrade ,, ,, „ »> 0° » „ 100° 



To convert degrees F. into degrees C. subtract 32 and multiply by f or 

 C = (F-32)5. To convert C° into T the formula is F-| O + 32. 



SOME OF THE INSTRUMENT-MAKERS WHO SUPPLY 

 PHYSIOLOGICAL APPARATUS. 



Backhouse, University College, London. 

 Butler, Physiological Laboratory, Oxford, 

 Cambridge Scientific Instrument Co. 

 Hume, Lothian Street, Edinburgh. 

 Kershaw, Cankerwell Lane, Leeds. 

 Meyer (J. F. ), Seilergraben 7, Zurich. 

 Palmer, 5 Kellett Road, Brixton, Londom 

 Petzold, Bayerische Strasse, Leipzig, 

 Rothe, Wenzelbad, Prague. 

 Siedentopf, Wiirzburg. 

 Runne, Basel and Heidelberg. 

 Verdin, Rue Linne 7, Parii. 

 Zimmermauu, Leipzig. 



