An important study of paralysis of the vocal cords was made by Gerhardt. He diagnosed the growth in the larynx of Friedrich III, Emperor of Germany, whose eventual death from this condition was to have such disastrous effects on German history.

Gerhard’s iron-chloride reaction for aceto-acetic acid in acetonaemic urine.

See No. 3270. Continuing his study of laryngeal paralysis. Gerhardt proposed the term “cadaveric position” to indicate the position of the vocal cord in total paralysis of the larynx.

Gerhardt edited this great work, which was written by the foremost pediatricians of the time and which gives a close-up view of pediatric knowledge at the end of the 19th century.