The first stain (the endospore stain) will detect cells that from endospores, and the capsule stain will detect bacteria with a mucoid capsule around it.
and he observed that these bacteria had the smooth capsules characteristic of the S strain. Based on these observations, Griffith hypothesized that a chemical component from the virulent S cells ...
While studying white blood cells, Miescher isolated ... scientists knew that some types of these bacteria (called "S type") had an outer layer called a capsule, but other types (called "R type ...