BY CHEMICAL EXPERIMENTS. 113
dense; for when I moved her fan backwards and forwards, I could feel the resistance of the air very plainly."
44 Well done, my little philosopher!" exclaimed Mr. Ashton. " Lewis, I dare say you have not forgotten all this."
" Oh ! no papa," said Lewis, " I often wish those days would come again, when Edward and I were always at home with you, and when we used to try experiments together."
" Well, Lewis, such days may come again," said his father; " but, now let us attend to the present sub≠ject, To make it clearer to you, I must ask you one more question about our experiments :ódo you re-