| 1 | Transfer the embryos (or adult) to the mortar containing liquid nitrogen. | |
| 2 | Stone mortars and pestles used to do the job. | |
| 3 | You can use your fingers to crumble the herbs into small pieces or use a mortar and pestle. | |
| 4 | The finer fraction (2 mm) of the samples was finely powdered in an agate mortar. | |
| 5 | The large mortars are of marble, and are used for pounding or pureeing shellfish, forcemeats, and so on. |