Charlotte approached the study of science in a balanced way, using both spontaneous observation and discovery as well as systematic study. The spontaneous part is done through nature study. The systematic part is done through reading and narrating living science books.
Nature study lays the groundwork for the systematic part, because it’s easier to read about something you have already seen for yourself. And it’s enjoyable at all ages, so it is continued through all the grades.
Does that help?