EXOGENOUS SERIES BROADLEAF WOODS. 119 



trees also differ in desirability. No two are alike. Beautiful 

 grain effects are often obtained in "crotches" or junctions 

 between trunk and branch, and such pieces bring high prices. 

 Mahogany is generally used as a veneer. Layers are glued 

 either to some central piece or ' ' core ' ' or else to one another. 

 The layers are arranged so as to cross one another's grain, 

 and results are usually thought to be more desirable than those 

 obtained from solid wood. Few woods glue better, and few 

 shrink or distort less when in place. 



' ' Spanish Cedar ' ' (Cedrela odoratd] is a broadleaf wood, and 

 not a conifer as is usually supposed. It is nearly related to, and 

 usually found and cut with, true mahogany. Lindley * divides 

 Cedrelecae into two sub-orders : Swieteniae, including the true 

 mahoganies, and Cedrelae, with nine genera and twenty-five 

 species distributed over tropical Asia and America. 



Prima vera or white mahogany belongs to Bignoniaceae, 

 which also includes the catalpas. 



* John Lindley, Treasury of Botany, p. 243, Part I ; also see Gifford, 

 " Forestry and Irrigation," Vol. VIII, No. 4, p. 174 ; also Correspondence Messrs. 

 Wm. E. Uptegrove & Brother, New York City 



