APPENDIX. 391 



THERMOMETRIC SCALES. 



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

 Reaumur o 80* 



Centigrade o 100 



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

 C = (F - 32)^. To convert into F the formula is F- f C + 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, London. 

 Petzold, Bayerische Strasse, Leipzig. 

 Rothe, "Wenzelbad, Prague. 

 Siedentopf, Wiirzburg. 

 Runne, Basel and Heidelberg. 

 Verdin, Rue Linne 7, Paris. 

 Zimmermanu, Leipzig. 



