TABLES 



NO. PAGE 



I. Length of tracheids in coniferous woods 17 



II. Length of wood fibres in dicotyledonous woods . . . .20 



III. One hundred and fifty trees of the United States arranged in the 



order of the average specific gravity of their dry woods . 50 



IV. Shrinkage of wood along different dimensions . . . .57 

 V. Important families and genera of Dicotyledons in the United States 129 



VI. Numerical conspectus of the trees of the United States . . 129 



VII. Indigenous woods with vessel perforations exclusively or predomi- 

 nantly simple ......... 135 



VIII. Indigenous woods with vessel perforations exclusively scalariform 136 



IX. Indigenous woods with spiral markings in part or all of the vessels 138 



X. Nature of pitting of vessel wall where in contact with ray paren- 

 chyma 139 



XL Occurrence of tyloses and gum deposits in vessels of indigenous 



woods ... ....... 141 



XII. Families with indigenous representatives exclusively diffuse-porous 143 



XIII. Indigenous ring-porous woods 143 



XIV. Nature of pitting in wood fibres of indigenous woods . . . 144 

 XV. Kinds of rays in indigenous dicotyledonous woods . . . 145 



XVI. Indigenous woods with " ripple marks.'' , , 146 



