Rivers, how the Mississippi River and others were pushed about in the Ice Age, [26];
how the Old Men of the Mountain helped the Ohio by turning some rivers around, [31];
how they helped make New England a great manufacturing section by turning some other rivers around, [32];
how they helped build the "Temple of the Winds," [33];
the little boy's definition of a river system, [66];
how the sea and the rivers take turn about in emptying into each other, [66];
their wonderful work in the mountains, [67];
the Mississippi River system, [67];
how they study the work of rivers on rainy days in Boston, [68];
how you can jump across the Mississippi, [69];
what springs do for rivers, [69];
how the springs act as regulators of river flow, [72];
how rivers grow at the top, [72];
why some rivers are born partly grown, [72];
how most of Europe's rivers get their start, [73];
why many little rivers have to jump to catch the train, [74];
why all rivers flow toward the sea, [75];
beautiful way in which Ruskin tells of the response of rivers to the call of the sea, [76];
the human nature in rivers, [76];
baby ways of baby rivers, [76];
why waterfalls are found only in young streams and more often as you near the source, [76];
how rivers play in the rain, [78];
storm chorus of the mountain torrents, [78];
where to look for hiding rivers, [78];
how rivers sleep in mountain lakes and how lively they are when they wake up, [80];
why rivers grow more thrifty as they grow older; how, with the help of the pebbles, they act as bankers for the farmers and the sea, [80];
the machinery of rivers includes circular saws and dirt-spreaders, [82];
how a river dug the Grand Canyon, [82], [88];
the automatic stop in the river machinery, [83];
enormous amount of soil carried by the Mississippi into the sea, [84];
how rivers cut mountains in two, [85];
how rivers help in mining granite, [97];
how they help make hills, [117];
how they combine with the boulders to help out the artists, [157];
the land in which there are river beds without rivers and rivers without mouths, [162];
the skeletons of dead rivers and what they tell of the past history of the desert, [166];
why dying rivers multiply by two, [167];
harbor engineering of the rivers and the sea, [221];
how rivers made the Golden Gate of San Francisco and so made San Francisco, [223];
the rivers and the rock mills of the sea, [227];
the river's trade-mark on its pebbles, [250]

Rocky Mountains, how they were born, [10];
their relation to the Mediterranean Sea that is no more, [135];
why they are now so far from the sea, [138];
how the mountain waves of stone resemble the waves of the sea, [140];
folded strata that illustrate Ruskin's line about the strange quivering recorded in mountain rocks, [142]

Romans, some of the big things we owe to them, [270]

Rose of Jericho, what it is like and how it puts to sea, [176]

Round Tops (Mt.), how they are formed, [123]

Ruskin, on the response of rivers to the call of the sea, [76];
on the sleep of lakes, [80];
on mountain drawing, [140];
on the strange "quivering of substance" of mountains, [141];
on the art lessons to be learned from stones, [158];
on the correct drawing of boulders, [160]

Sahara Desert. (See [Desert].)

St. Lawrence River, how the Old Men of the Mountain took some of its rivers away, [30];
how the Old Men used it in making the Great Lakes, [34]

Salt, how Mother Nature uses it in warming over rocks, [99];
how Father Neptune uses it in his rock mills, [217]

Sand, how it helped build the stone "Temple of the Winds," [33];
how Mother Nature dissolves it out of sandstone in her rock cookery, [99];
how the crystal fairies give sand grains a new lease of life, [108];
how the sand helped shape the old Indian of Mt. Abu, [147];
color of desert sand, [165];
how the desert makes its sand, [168];
"sand roses," [168]