Among different types of alkaloids the structure of those derived from indole is least known. The constitution of only very few members of this group is fixed, and in most cases it remains obscure. #1. On the Alkaloids of Calycanthus floridus L. #2. Experiments on the Alkaloids of Calycanthus floridus #3. Experiments with Calycanthine #4. Experiments with. Calycanthidine #5. On the Constitution of Aspidospermine #6. Experiments with Aspidospermine