However, Joan's study in herbalism could not be contained within the conventional herbalism to focus on pharmacy, and he developed his study toward natural history by actively collecting a wide range of sample animals, plants and minerals for further investigation.
だが、恕庵の本草学はそれまでの薬学に重きを置くものに収まらず、積極的に多種多様の動植物、鉱物を収集し博物学的なものに発展していた。