| Rating | Solver | Clue |
|---|---|---|
| ESSAY | Treatise | |
| THESIS | Student's treatise | |
| TRACT | Short treatise | |
| WRITING | Long treatise | |
| TREATY | A treatise; a tract. | |
| CHEMISTRY | A treatise on chemistry. | |
| PETROLOGY | A treatise on petrology. | |
| BRONTOLOGY | A treatise upon thunder. | |
| PHILOSOPHY | A treatise on philosophy. | |
| PHYSIOLOGY | A treatise on physiology. | |
| GNOMONOLOGY | A treatise on gnomonics. | |
| CHROMATOLOGY | A treatise on colors. | |
| PHTHISIOLOGY | A treatise on phthisis. | |
| HERESIOGRAPHY | A treatise on heresy. | |
| ICHTHYOGRAPHY | A treatise on fishes. | |
| ORCHESOGRAPHY | A treatise upon dancing. | |
| CHROMATOGRAPHY | A treatise on colors | |
| TRETYS | A treatise; also, a treaty. | |
| ALGEBRA | A treatise on this science. | |
| GEOLOGY | A treatise on the science. | |
| ZOOLOGY | A treatise on this science. | |
| ETHOLOGY | A treatise on morality; ethics. | |
| GEOMETRY | A treatise on this science. | |
| GEOGRAPHY | A treatise on this science. | |
| TREATISER | One who writes a treatise. | |