1. substance that causes solid matter in solution to deposit.   Hint First letter clue   2. time when sun is farthest from the equator.   First letter clue   3. substance which provides nourishment.   First letter clue   4. stone to test gold alloys; criterion.   First letter clue   5. ring (of leaves around the stem).   First letter clue   6. animal with four feet.   First letter clue   7. vertebrate animal whose female suckles the young.   First letter clue