262 GLOSSARY. 



Transmit, to permit to pass, to convey through. 



Tint, shade, hue, color. 



Transition, rocks which appear to have been formed while the 

 earth was in a state of transition, from a state of desolation 

 to a habitable condition. They have a texture partly me- 

 chanical and partly chemical. 



Urea, the principal element, next to water, in the composition 

 of the urine. 



Vhnic acid, a substance formed by the action of acids on 

 sugar. 



Unconsolidated, soft, not consolidated. 



Umbel, a kind of infloresence in which the flower stalks diverge 

 from one centre, as the wild parsnep. 



Volcano, a burning mountain. 



Vision, sight, the act of seeing. 



Veins, cracks or fissures in rocks which are filled with sub- 

 stances different from the rock, either mineral or earthy. 



Volcanic, pertaining to volcanoes, produced by volcanoes. 



Vertical, perpendicular, overhead. 



Vapor, mist, fog, small particles of water. 



Vesicles, small particles or drops. 



Verticil, whorled, having leaves or flowers in a circle round 

 the stem. 



Volatile, evaporating or flying off easily. 



Vascular, made up of vessels, or full of vessels. 



Vasiform tissue, is made up of large tubes. 



Venation, the arrangement of the ribs or veins in leaves. 



Viscid, stringy, sticky, slimy. 



VerticiUate, whorled. 



Verdure, foliage, herbage. 



Vibrate, to swing or oscillate. 



Vacuum, an empty space, a space from which the air has all 

 been removed. 



Vitality, life, the vital or living principle. 



