This little book was written, says Dr. Wylie, "in fulfillment of a promise made to him [Senn] many times, a compact, mutually agreed on, whereby one of us, God alone knew which, was to perform this service for the other." While in no sense a biography, yet many interesting facts of a biographic nature are given—touches that make the dead surgeon live again. By those who, like Dr. Wylie, were close personal friends of Dr. Senn as well as by those who, while unacquainted with him, yet entertained the highest respect for him both as a man and as a surgeon, this little "appreciation" will be read with pleasure and interest.