Justus Freiherr von Liebig ( 12 May 1803 - 18 April 1873 ) was a German chemist who made major contributions to agricultural and biological chemistry , and worked on the organization of organic chemistry .
Justus Liebig ( 12 May 1803 - 18 April 1873 ) was a German chemist who made major contributions to agricultural and biological chemistry , and worked on the organization of organic chemistry .