Life Progressive. 417 
accumulation, the human implements themselves bearing evi- 
dence of an exceedingly barbarous condition of the human 
species. Post-Pliocene, or Paleolithic man, was clearly 
unacquainted with the use of the metals. Not only was this 
the case, but the workmanship of these ancient races was 
much inferior to that of the later tribes, who were also igno- 
rant of the metals, and who also used nothing but weapons 
and tools of stone, bone, etc., in war, chase and domestic 
affairs. When first man spread over the earth, he had no 
domestic animals, perhaps not even the dog, and had no 
knowledge of agriculture. His weapons were of the rudest 
character, and his houses scarcely worthy of the name. No 
doubt can exist that his food, habits and entire manner of 
living have varied as he has passed from country to country, 
for he must then have been far more subject to the influence 
of external circumstances, and in all probability more sus- 
ceptible of change. Moreover, his form, which is now ste- 
reotyped by long ages of repetition, may reasonably be pre- 
sumed to have been more plastic than is now the case. As 
long as man led a mere animal existence, he would be sub- 
ject to the same laws, and would vary in the same manner as 
the rest of his fellow-creatures. But when at last he had 
acquired the capacity of clothing himself, and of making 
weapons or tools, he has taken away from nature, in a great 
measure, that power of changing the external form and 
structure which she exercises over all other animals. From 
the time, then, when his social and sympathetic feelings came 
into active operation, and his intellectual and moral faculties 
became fairly developed, man’s physical form and structure 
would not be so much influenced by natural laws, and, there- 
fore, as an animal, he would become almost stationary, his 
environment ceasing to have upon him that powerful modi- 
fying effect which it exercises over other parts of the organic 
world. But from the moment that his body became less sub- 
ject to the changes of the surrounding universe, his mind 
would become acted upon by the influences which the body 
