MAP V. — DENSITY OF THE WHEAT CROP. 



The wheat belt stretches in a broad section of a circle from Bahia Blanca to Santa Fe, 

 which is now reached by maritime vessels. The cultivation of wheat crosses the line 

 of 600 millimetres of rainfall, and even the 400-millimetre line, in proportion as one 

 passes from the area of summer rein to that of spring and autumn rain. 



To face p. 203, 



