Walker's Statistical Atlas of the United States. 85 
times they exhibit facts that absolutely refuse to be shown by 
mere numerical tables. In short, as already suggested, the very 
reason of their being is because words and numbers cannot or 
will not tell the whole truth. 
The principles involved in the construction of the various 
illustrations are fully discussed in the text or on the plates. 
u 
interest in such a work. The shadings of 55 maps and the 
construction of more than 1,200 figures are based on computa- 
tions from census data. Some of these computations were very 
elaborate ; in other cases, where simple, the actual labor neces- 
sary was very large. For instance, in the preparation of crop 
maps it is not easy to show at the same time “ the importance 
Now the rule adopted, arbitrary to be sure, but 
i ws: ‘The number of 
of the entire work. It is probable that over 200,000 computa- 
tions were performed. 
e work is divided into three parts. The first, relating to 
the “Physical Features of the United States,” contains ten 
maps, five of which are double page. The map of the River 
Systems (by Gen. von Steinwehr) is the best yet published to 
peer Rtg drainage areas. It has, moreover, combined with 
dogmatic theorizing. A comparison of these maps shows that 
