A child who has splashed in a puddle has a richer understanding of a pond. A child who has climbed a tree has a broader grasp of what was involved when explorers first climbed Everest. A child who has collected stones or shells has a deeper grasp of what is involved in scientific classification later.
All things both great and small:
For the dear God who loveth us,
He made and loveth all."
As it is with the birds and the moths, so is the best Science in all areas. Science is a pattern of thought, of observation, correlation, theory, hypothesis, experimentation, and more thought. The methods of Science apply to all subjects. Therefor, it does not really matter where you begin to teach Science. Begin where you are- with the moth on the patio, the birds on your birdfeeder, the aquarium in the kitchen, the volcano in your cornfield. Spend the time needed to really look, and think. In Graduate microbiology classes, time was the most precious resource there was. I spent many long evenings staring through a microscope examining the characteristics of some bacteria or fungi. We went through complicated procedures to obtain electron microscope photographs, which we would blow up and hang where we could see them every time we raised our eyes. We had to, because they didn't come labeled- we had to think and identify each structure ourselves. The Science was not in the fancy equipment, it was in the time we spent thinking. We learned the names, we kept vocabulary notebooks (half of any subject is vocabulary), we wrote detailed lab reports. These were not the Sciences- the real work was our lab notebooks, where we kept our notes of what we saw, what happened, what we thought might happen. Lab notebooks are the personal property of the individual scientist, and are the most valuable part of his work.
A Charlotte Mason Nature Notebook is a lab notebook. Teach your children to write down everything they see. The illustrations should be as detailed as possible, the notes should never be removed. A young child may do better with loose-leaf paper, but a teen should learn to keep notes in a bound book where removing pages shows! If they make a mistake (such as in a math calculation) they may draw a line through it, but never obliterate. Obviously, different notebooks should be kept for each topic. Edith Holden did not keep her chemistry notes in her Diary. Her chemistry notebook would have held illustrations of her experiments, notes of colors and reactions, tables of data, titles and quotations applicable to the experiment, and her conclusions."