GLOSSARY 



Acid, a chemical name given to many sour substances. 



Albumen, a nitrogenous organic compound. 



Albuminoid, a nitrogenous substance resembling albumen. 



Ammonia, a gas containing nitrogen produced by the de- 

 cay of organic matter. 



Annual, a plant that lives only one year; corn and sun- 

 flower are examples. 



Anther, the part of a stamen that bears the pollen. 



Available, that which can be used. 



Bacteria, very small plants, so small that they cannot be 

 seen without the aid of a powerful microscope. They are 

 sometimes called " germs." Some of them are beneficial, 

 some do great harm and some produce disease. 



Biennial, a plant that lives two years, usually producing 

 seeds the second year. 



Bordeaux mixture, a mixture of copper sulphate, lime 

 and water used to prevent plant diseases. It was invented 

 in Bordeaux, France. 



Bud, an undeveloped branch. 



Calyx, the outermost part of a flower. 



Cambium, the active growing layer between the bark 

 and the wood of a tree. 



Capillary, Hair-like. A name given to very small 

 spaces through which water flows by the force of capil- 

 lary attraction. 



Carbohydrate, an organic substance made of oxygen, 

 hydrogen and carbon, but containing no nitrogen ; cellulose 

 or woody fibre, sugar, starch are examples. 



Carbon, a chemical element. Charcoal is nearly pure 

 carbon. 



16 241 



