(fallen london stamps by Another missive arrives from the doctor. This one is also practical in nature, and concerns the sigils one might apply for purposes ranging from diverting gravity to reheating tea. It is perhaps not very useful for one seeking to understand the linguistic details of the Correspondence, but at least there are examples of the relevant sigils enclosed.
The latest missive from the good doctor is almost as poetic as it is incomprehensible. It concerns chains. The chains that all life labors under. The ways that those chains might be broken. The words one might use to do so, when judiciously applied to a weak link in reality... You should probably not be seen with this kind of literature. Thankfully it burns itself.
the good doctor is a normal person who only sends people normal letters that don't catch on fire (lie)