GLOSSARY. 263 



Vital functions, those functions or actions which arc indispen- 

 sable to organic life. 



Vetches, a liguminous plant allied to the pea, bean, and lentil 



Warping, a process in agriculture similar to irrigation. 



Wealden, a fresh water group of rocks, composed of clay, lime 

 marl, &c. 



Zigzag, in a crooked direction, forming short angles. 



Zenith, that point in the sky or celestial hemisphere which, is 

 vertical to the spectator. 



Zanthine, a substance found in urinary calculi 



Zeolite, a mineral composed of silica, alumina and lime. 



