He laid out how doctors should conduct themselves professionally, how to record patient records, and even suggested matters of personal hygiene for physicians, right down to their fingernails.
Sarsaparilla still has a popular reputation as an "alterative," but it has been examined and tested in every manner known to modern medical science, and is professionally regarded as "pharmacologically inert and therapeutically useless."
He was indeed professionally and in the first place a painter; but throughout his career a great, and on the whole the most successful, part of his industry was devoted to drawing on the block for the woodcutter or engraving with his own hand on copper.
On the desertion of schoolmastering as a profession, Thoreau became a lecturer and author, though it was the labour of his hands which mainly supported him through many years of his life: professionally he was a surveyor.
These prosecutions, in most cases, were no doubt instigated by Sir John Scott, and were the most important proceedings in which he was ever professionally engaged.