Obituary of Gerhardt. 105 
partnership. Discussion was the order of the day in that laboratory and 
ur years before under the following circumstances. a 
One of his friends, a chemist and somewhat of a physicist, who was 
also then in adversity, had just made an invention which was full of 
But before his friend was able to carry out the plan, an opportunity 
offered for completing the French edition of Berzelius. The idea of in- 
Which Berzelius re ted by Az2H® and which the partisans of equiv- 
alents wrote AcH®. To reconcile such different notations Gerhardt wrote 
the A and H with a bar across, a manner of writing formulas already em- 
Ployed by Berzelius and which serves to show that Az and H® should be 
en twice to represent one equivalent of azote and three of bh drogen. 
SECOND SERIES, VOL. XXIII, NO. 67.—JAN., 1857. 
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