GLOSSARY. 
Acrogens (Gr. alcros / highest ; gennao , T produce). Plants 
which increase in height by additions made to the 
summit of the stem by the union of the bases of the 
leaves. 
Actinozoa (Gr. aktis, gen. aktinos , a ray ; and zoon an 
animal). That division of the Coelenterata of which the 
sea anemones may be taken as the type. 
Agnostus (Gr. a, not; gignosko , I know). A genus of 
Trilobites. 
Alethopteris (Gr. alethes , true ; pteris , a fern). A genus of 
ferns. 
Algae (Lat. alga, a marine plant). The order of plants 
comprising the seaweeds and many fresh-water plants. 
Amphibia (Gr. amphi , both; bios , life.) Animals like the 
frogs and newts, which have gills when young, but 
can always breathe when adult. 
Angiosperms (Gr. angeion, a vessel ; sperma , a seed). 
Plants which have their seeds enclosed in a seed-vessel. 
Annularia (Lat. annulus , a ring). A genus of Palaeozoic 
plants, with leaves in whorls. 
Aqueous (Lat. aqua, water). Formed in or by water. 
1 The Greek &= English c, arid the Greek u English y . 
