INDEX 



431 



recreations depending upon 94, 95 



safe and unsafe 92 



sun drawing 86 



used in cooking 93 



uses of 88-95 



Weathering 228 



chemical 229 



mechanical 228, 229 



Wells, safe and unsafe 



Woodpecker 



Wool for underclothes 



Workbook, use of . . 



279 



366 

 9 



Yardstick, astronomers . . 190, 191 



Young, rearing of 269 



Yeasts 333-336 



