Jour. Sc. Coll. Vol. IV. PI. XXXIX. 



SO' 100" 120' 140° 160° 180° L'"'(t = 



Temperature in Centi»-rade Decrees. 



-'40° 'ICO" ^80' 300 



■lA 25 27 21) 33 35 



Thousandth parts of Electromotive Force. 



:j'.t 41 41! 47 4!» 51 



