Update categories.md

sandbox/categories.md

@@ -13,6 +13,10 @@ As can be seen by the bar graph below, "casting" by far has the most entries of
 
 ### Raw Data and Generation
 
-This plot is generated by [context_viz.py](https://github.com/ronikaufman/manuscript-object/blob/context/context_viz.py) developed by [Roni Kaufman](https://github.com/ronikaufman) in summer 2020 using underlying workflows in [cu-mkp/manuscript-object](https://github.com/cu-mkp/manuscript-object).
+This plot is generated by [**context_viz.py**](https://github.com/ronikaufman/manuscript-object/blob/context/context_viz.py) developed by [Roni Kaufman](https://github.com/ronikaufman) in summer 2020 using underlying workflows in [cu-mkp/manuscript-object](https://github.com/cu-mkp/manuscript-object).
 
 The raw data (the xml-encoded transcriptions and translations of the manuscript text) is found in [cu-mkp/m-k-manuscript-data/ms-xml](https://github.com/cu-mkp/m-k-manuscript-data/tree/master/ms-xml).
+
+### Notes and Observations
+
+- Alchemy: While the manuscript was originally thought to contain alchemical writings, as was common for many "Books of Secrets" in the Renaissance that contained first-hand experimentation, the ditribution of categories shows that "alchemy" is one of the least prevalent categories. In fact, there is only one entry that is "alchemical": [fol. 52r, "The work done in Algiers"](https://edition640.makingandknowing.org/#/folios/52r/f/52r/tl)