Lennander was professor of surgery in the University of Upsala from 1892 until his death in 1911 at the age of 51. The republication of his collected works by the university indicates the high value placed on his work by those among whom it was carried on. Lennander had many firends among American surgeons, and it is on this account and according to his personal wish that the articles originally published in Swedish have been translated int English. The articles publsihed in German and in French are reprinted without change. This makes the writings of Lnuander easy of access and this is desirable because he made contributions of permanent valur to the literature of surgey.