- Salisbury, James Henry, 1823-1905, author1
- Seaman, William H., 1837-1910 author1
- Seiler, Carl, 1849-1905, author1
- Speir, S. Fleet, author1
- State Microscopical Society of Illinois.1
- Suffolk, W. T., author1
- Sullivant, William Starling, 1803-1873, author1