|
|
|
|
|
53:8 ·
A sign used in eighteenth-century chemistry for sal sedativus or calming salt, probably the same as sal sedativum, boric acid. |
|
|
|
|
|
|
|
53:8 ·
A sign used in eighteenth-century chemistry for sal sedativus or calming salt, probably the same as sal sedativum, boric acid. |
