It is very beautiful to see that God has formed His creatures on such different plans, and though we shall be able to say very little about them, I hope you will by-and-by study Natural History, and learn more and more of His care in fitting each for the life it has to live. But remember that all these types of animals, the Radiates, Molluscs, Articulates (as the members of the "ringed" family are sometimes sailed), existed in the most ancient times: they lived side by side, as it were, and were not, as some philosophers would have us believe, derived from each other. Each was "after its kind," and each species remains; animals may alter from changes in their way of life, but there is no passing from one _kind_ to another. Now I think you will be interested to hear that in the Stone Book, some of the most ancient "letters" are formed from creatures belonging to the Invertebrate Group. We were speaking just now of the white clay brought up from the depths of the Atlantic Ocean by the sounding line. The microscope shows that it consists of the imperishable part of creatures, tinier than any you can imagine, which had the power when living of extracting from the sea-water--as I told you is the way of the corals--the lime which formed their outer coat, or skeleton. These busy workers lived their little day, and then as they died, the shell-like coverings sank to the bottom of the sea, forming, as ages passed, thick beds of chalk, such as that of which the white cliffs of Dover are built up. Then, as the sounding-line searches still deeper ocean-depths, it brings up a red clay, and this again is shown by the microscope to be composed partly of very minute creatures of a reddish colour, which live near the surface of the ocean, but when they die sink to the bottom. Sponges, too, which form the home of great numbers of little radiates, grow upon the ocean floor or near the bottom of the sea; their tiny tenants, like minute cells, living upon still smaller creatures contained in the water which is held by the sponge. And we are told that in some places the bottom of the sea is strewn with star-fishes and their relations, some of them very beautiful in form and colour, but all formed on the same plan of a central plate, from which five arms or fingers radiate. Do we not better understand that the waters did indeed "swarm with swarms" when we learn even a little about these living creatures, many of them so small that we should not be aware of their existence if we had no microscope to reveal to us their countless myriads?