Illustrations have been moved from the middle of a paragraph to the closest paragraph break. The word up-hill and uphill has been retained in both versions. Other than the corrections listed below, printer's inconsistencies in spelling and punctuation have been retained: changed "spent mainly indoors?" into "spent mainly in-doors?" page 39 changed "his work on "Sleep," as to" into "his work on "Sleep", as to" page 44 changed "them "photographed, stripped to the waist, both" into "them "photographed, stripped to the waist", both" page 144 changed "the 'longshore-man--all at" into "the 'longshoreman--all at" page 180 changed "bar A A, the operator simply" into "bar A A', the operator simply" page 216 changed "meets the breast-bone, until" into "meets the breastbone, until" page 244 changed "out at arms-length, say" into "out at arm's-length, say" page 249 changed "it to the floor. and so" into "it to the floor and so" page 258 changed "and fore-arm work, catch" into "and forearm work, catch" page 274