I want to correct one or two misconceptions about the way the Danes have sought to improve their native Landrace breed, to try and decide the extent of the improvements which can be fairly attributed to progeny testing, and to describe a few of the features which are characteristic of Danish methods. Owing to the shortage of time I shall refrain from giving any account of the mechanics of testing in Denmark. As this has often been reported you should have sufficient knowledge of the daily procedure at testing stations to provide an adequate background to this paper.