NOTES 
PRE-PAL^OZOIC AGES 
PAGE LINE 
7 1 38 There is no geological evidence of a satisfactory nature that 
life existed in these Ages. That life did then exist 
may, however, be reasonably inferred from the com- 
paratively advanced forms in which it appears in the 
Cambrian period. 
8 1 77 This is known as the morula, or mulberry-like stage. 
9 183 This is known as the blatosphere, or bud-like stage. 
9 189 This is known as the gastrula, or belly-forming stage. 
10 215 This is known as the trocosphere, or wheel stage. Worms 
are developed from three layers of cells. 
PALEOZOIC AGE 
CAMBRIAN PERIOD 
1 1 10 The Mediterranean Sea is but a remnant of a vast oceanic 
area. Bonney, The Story of Our Planet " p. 464. 
11 15 It was probably from a continent to the west, and which 
may have included Ireland, that the sediment was 
carried, which formed on the site of Wales what are 
known as the Cambrian beds. Bonney, p. 396 
1 2 26 The sea at this time probably covered seven-eighths of the 
globe. At the present time it covers rather less than 
three-fourths. 
223 
