| Answer | Crossword Clue |
|---|---|
| ETHNOGRAPHICAL | Of science that treats of races and nations. |
| photometry | that branch of science which treats of the measurement of the intensity of light |
| photometries | PHOTOMETRY, that branch of science which treats of the measurement of the intensity of light |
| chromatics | the science of colors; that part of optics which treats of the properties of colors |
| photometrist | one who practises photometry, that branch of science which treats of the measurement of the intensity of light |
| photometrists | PHOTOMETRIST, one who practises photometry, that branch of science which treats of the measurement of the intensity of light |
| energetics | that branch of science which treats of the laws governing the physical or mechanical, in distinction from the vital, forces |
