PROOFS OF EVOLUTION. 
63 
XV. 
A SUMMARY OF EVIDENCE. 
In closing we will briefly present a summary 
of evidence. 
Astronomy declares the unity and universality 
of the laws of gravitation and evolution. The 
Nebular Hypothesis explains how by the operation 
of these laws “the infinite meadows of heaven” 
are filled with orbs “unutterably bright.” 
Geology describes the Evolution of the Earth 
from a formless void to wrinkled age. Entombed 
within the leaves of rock are found in nice 
gradation all forms of upward-tending life, no 
sharp lines between the types, but insensible 
shading from first to last. As a writer happily 
puts it: “ It is as if Nature wrote her own auto¬ 
biography, using for an alphabet the hieroglyphics 
of life.” 
Embryology testifies as to the method of animal 
evolution. It is a brief summary of the story of 
the race in the life of the individual, a rehearsing 
