...us to the contrary, the chalk might be a kind of gigantic fur upon the bottom of the earth kettle, which is kept pretty hot below. Let us try another...examined microscopically, it would show itself to be a more or less distinctly laminated mineral substance,- and nothing more. But the slice of chalk...

...a kind of gigantic fur upon the bottom of the earthkettle, which is kept pretty hot below. Let из try another method of making the chalk tell us its...desirable. A thin slice of the fur of a kettle might bo made in the same way. If it were examined microscopically, it would show itself to be a more or...

...chalk tell us its own history. To the unassisted eye chalk looks simply like a very loose and opfcn kind of stone. But it is possible to grind a slice of chalk dowu so thin that you can see through it — until it is thin enough, in fact, to be examined with...

...or, to take a more familiar example, the fur on the inside of a tea-kettle is carbonate of lime. e. To the unassisted eye, chalk looks simply like a very...any magnifying power that may be thought desirable. When examined under a microscope, the general mass of it is seen to be made up of very minute granules,...

...method of making the chalk tell us its own history. To the unassisted eye chalk looks simply like n very loose and open kind of stone. But it is possible...of chalk down so thin that you can see through it — uuiil it is thin enough, in fact, to be examined with any magnii \ ,ug power that may be thought...

...own history. To the unassisted eye chalk looks skaply like a vrry loose and open kind of stoBO. lint it is possible to grind a slice of chalk down so thin that you can see through it — uuiil if, is thin enough, in fact, to be examined with any magnit^ug power that may be thought...

...; or, to take a more familiar example, the fur on the inside of a tea-kettle is carbonate of lime. To the unassisted eye, chalk looks simply like a very...it— until it is thin enough, in fact, to be examined Avith any magnifying power that may .be thought desirable. of an inch in diameter, having a well-defined...

...composed from more or less pure carbonic acid and lime. HOW IT APPEARS UNDER THE MICROSCOPE. If you grind a slice of chalk down so thin that you can see through it, it appears quite differently, when it is observed under the microscope. Generally, the mass consists...

...of what are called stalagmites and stalactites, is carbonate of lime. CJrptrr^ake a more""fUmiltar example, the fur on the inside of a tea-kettle is...examined microscopically, it would show itself to be a more or less distinctly laminated mineral substance, and nothing more. But the slice of chalk...

...would be a great bubbling and fizzing, and, finally, a clear liquid, in which no sign of chalk would appear. Here you see the carbonic acid in the bubbles...examined microscopically, it would show itself to be a more or less distinctly laminated mineral substance, and nothing more. But the slice of chalk...