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Table 2. Products mentioned in the text.
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| Hydrostone: |
Gypsum cement, manufactured by United States Gypsum, Chicago, IL 60606 |
| Mortar Color: |
Concentrated dye, manufactured by Solomon Girnd-Chem Service Inc., Springfield, IL 62705 |
| Specimen Boxes: |
Clear plastic containers (about 19x14x10 cm) with friction fitting lids, manufactured by Tri State Moldeed Plastics, Inc., Dixon, KY 42409 |
| 3-in-One Household Oil: |
Light lubricant, manufactured by Boyle-Midway Inc., New York, NY 10017 |
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