| Answer | Crossword Clue |
|---|---|
| OPTICS | Subject of a Helmholtz treatise. |
| PLANEGEOMETRY | Subject of a Euclidean treatise |
| WHIST | Subject of a Hoyle treatise |
| PRINCE | Subject of treatise by Machiavelli. |
| Answer | Crossword Clue |
|---|---|
| OPTICS | Subject of a Helmholtz treatise. |
| PLANEGEOMETRY | Subject of a Euclidean treatise |
| WHIST | Subject of a Hoyle treatise |
| PRINCE | Subject of treatise by Machiavelli. |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.