Questions Evolution Does Not Answer 
and gradual changes. There are 
others who hold that the evolu¬ 
tionary process has been one of 
crises and catastrophes with sud¬ 
den appearances and disappear¬ 
ances of certain forms, and with 
long intervening periods of com¬ 
parative inactivity and stagnation. 
In explaining the exceeding rare¬ 
ness of transitional forms, Le Conte 
says: “I believe that the true rea¬ 
son of this is that the steps of evo¬ 
lution are not always uniform. 
Nearly all evolutionists have as¬ 
sumed, and even insisted, on uni¬ 
formity, as the opposite of catas- 
trophism and of supernaturalism, 
and, therefore, as essential to the 
idea of evolution. They say that 
the constancy of the action of the 
forces of change necessitates the 
uniformity of the rate of change. 
But, in fact, this is not always, nor 
even usually, true. Causes or forces 
