In the last several months, I've been exploring the connections between umbral calculus and integer sequences and have published several items, searchable under the name Tom Copeland, in the Online Encyclopedia of Integer Sequences (OEIS). During the process, I became aware of the ubiquitousness of trees in combinatorics and found it useful to go back to the origins to get a good feel for them. The resulting set of notes "A Walk in the Woods with Cayley and Comtet " might be a helpful introduction to others on some elementary relations between the infinitesimal calculus and rooted trees ala Cayley.