A TEXT-BOOK OF BOTANY. 



A manna is also yielded by Cedrus Libani and Lari.v decidua. The 

 latter is known as " liriancon Manna," and contains melizitose. 

 The bark of some species furnishes valuable tanning material, as 

 that of the hemlock spruce (Tsitga canadensis). 



Thuja 



FlG. 76. Fruiting twig of common Juniper (Juniperus communis}, of Red Cedar or 

 Savin (Juni penis vir^inmnn ). and young twig of White Cedar or Arbor Vitee (Thuja occiden- 

 talis). From "Minnesota Trees and Shrubs." 



The Conifene yield large quantities of volatile oils, resins, and 

 allied products which are used both in medicine and the arts. 

 A number of them yield turpentine (see Vol. TI). Lari.v decidua 

 of the Alps and Carpathian mountains yields Venice turpentine. 

 . Ibics balsamca is the source of Canada turpentine or balsam of 



