- I continued to practice the method I had set for myself. In addition to following its rules for all my thoughts generally, I set aside certain hours specifically to apply the method to solving mathematical problems or even to questions from other sciences. By removing these questions from the less certain principles of those sciences, I made them almost as precise as mathematical problems. You can see evidence of this in the many examples included in this volume.
- Rhodonite (Wikipedia)
Rhodonite is a manganese inosilicate, with the formula (Mn, Fe, Mg, Ca)SiO3, and member of the pyroxenoid group of minerals, crystallizing in the triclinic system. It commonly occurs as cleavable to compact masses with a rose-red color (its name comes from Ancient Greek ῥόδον (rhódon) ‘rose’), often tending to brown due to surface oxidation. The rose-red hue is caused by the manganese cation (Mn2+).