coral and coral reefs

Coral and Coral Reefsby Thomas H. HuxleyTHE subject upon which I wish to address you to-night is the structureand origin of Coral and Coral Reefs. Under the head of "coral" thereare included two very different things; one of them is that substancewhich I imagine a great number of us have champed when we were verymuch younger than we are now,the common red coral, which is used so...