THE ILLUSTRATIONS
In furtherance of the idea referred to in the preface, that a far more effective use may be made of pictures in teaching than is usual, a very extended use has been made of them in "The Strange Adventures of a Pebble," and, moreover, these pictures have been made to talk, as it were, by means of extended analysis and comment upon their significant features; this for the double purpose of teaching important facts, as only pictures can teach, and of stimulating the invaluable habit of observation and of logical reasoning about things observed.
One of the main purposes of the book, as stated in the preface, is to stimulate interest in further reading and study on the many subjects to which it relates.
The author wishes to make special acknowledgment of the co-operation of the editor of St. Nicholas and the following publishers in supplying the illustrations on the pages indicated:
The Macmillan Co.: [11], [29], [36], [41], [52], [83], [108], [121], [132], [145], [152], [168], [173], [195], [221], [225], [226], [235], [240], [249], [254], [257]. The Century Co.: For the following from the St. Nicholas magazine: [38], [47], [70], [184], [199].
D. Appleton and Co.: [12], [22], [60], [97], [102], [136], [141], [224], [236], [241], [243], [245], [247], [252], [257]. G. P. Putnam's Sons: [59], [105], [147]. E. P. Dutton & Co.: [157]. Henry Holt & Co.: [37], [84], [149], [193], [207], [250]. Silver Burdett Co.: [28]. World's Work: [79]. Geological Survey: [13], [23], [114], [130], [194], [238]. Wisconsin Survey: [33]. Encyclopædia Britannica: [256].