Liebig Trade Cards and Maps Over a period of almost exactly a century the Liebig company produced trade cards as free gifts for customers. A few of these attractive cards depict maps as well as views and local produce. During the Hungry Forties when even bread was scarce and meat too costly for the general population a gifted German chemist announced a spectacular breakthrough.' In 1847, in his treatise Extractum Carnis , Justus Freiherr von Liebig explained how to make beef extract. Justus Freiherr von Liebig (the title Freiherr or Baron being awarded in 1845) was born in Darmstadt (12 May 1803). He studied chemistry, becoming a teacher at Giessen University and helping to establish it as one of the premier scientific addresses in the middle of the nineteenth century. A researcher in many fields he is especially remembered for work in the field of organic chemistry. He was the discoverer of chloroform and gave the ethyl group C2H5 its name. He improved the techniques and approach