1885.] Recent Literature, ` 281 
lapse of thirty centuries or of five would account equally well 
for the development of the civilization they represent.” Short’s 
opinion is quoted with approbation that “ one or at the most two 
thousand years only can have elapsed since the mound-builders 
were compelled to abandon the valleys of the Ohio and its tribu- 
taries, and but seven or eight hundred since they retired from the 
shores of the Gulf of»Mexico. Lastly, the early explorers found 
mounds occupied and even being constructed within the last few 
hundred years.” 
Erratic blocks covered with figures, Arizona. 
The accounts of the ruins and people of Central America and 
Peru are useful and timely, as is the chapter on the physical 
structure of the early man of America; the latter is often critical 
and with full references to the most recent authorities. 
ur impression formed from reading and observation is that 
the view that there is an unity of race in North and South 
America, that the continent was peopled from Asia by way ot 
Bering straits, and that the race shared the continent with only one 
