He loved to experiment and was thus one of the pioneers of chemistry as a science and of the chemical analysis itself. Around 100 years later, the chemists Antoine Laurent Lavoisier (1743–1794) and Joseph-Louis Gay-Lussac (1778–1850) laid the foundation for the principle of organic elemental analysis. To this day, this principle is based on combusting a sample followed by the qualitative determination of the reaction gases. Lavoisier, for example, analyzed waxes, oils and fats and discovered that all organic matter contained carbon, hydrogen and oxygen. However, the exact share of each of the elements remained a mystery.