Appendix I 



387 



Thorax. The middle part of an insect's body. 



Tillage. The act of preparing the ground to receive the seed and the 



cultivation of the plants. 



Tuber. A thickened underground stem, as an Irish potato. 

 Tubercle. A small wart-like growth on the roots of legumes, caused 



by the nitrogen-fixing bacteria. 

 Variety. A kind or sort of plant. 

 Viable. Capable of germinating. Having life. 

 Vigor. Referring to the rapidity of growth, without reference to 



hardiness. 



Vital. Of, or pertaining to living things. 



Water-Table. The line of free or gravitational water in the soil. 

 Weathering. The action of moisture, air, frost, upon rocks, etc. 

 Weed. A plant where it is not wanted. 

 Wilt. Used synonymous with blight. 

 Zoology. The science that treats of animals. 



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