q6o 



Index 



Wheat, 199, 217, 237; black rust of, 418; 



macaroni, 211; production, 357. 

 White pine, 318, 346; blister rust of, 419. 

 Wild garlic, 226, 227. 

 Willow family, 533. 



Wilt disease, of cotton, 298 ; of cucumber, 428. 

 Wind, effects of, 214; pollination, 243. 

 Wood, 136; distillates, 350; sections, 154, 



156; structure and use, 155. 

 Woods, classification of, 152. 



Xeniophyte (endosperm), 250, 272, 522. 

 Xerophytes, 95 ; various types of, 170. 



Yeast, 410. 



Yellow pigments, 52, 55, 56. 

 Yellow pine, wood of, 154. 

 Yucca, 169; and pronuba, 246; in bloom, 

 529- 



Zygote, 243, 250, 446, 521. 



