Conditions 



37 



unusual for the water in a stream to disappear 

 into the substrata during the dry season and 

 reappear at a lower level. As the areas so affected 

 vary from year to year, it was necessary to inspect 

 the stream beds up to their sources. There are 



RAINFALL CHART 



many marshy areas of large extent within fifteen 

 miles from the Atlantic and six miles from the 

 Pacific, in addition to the inland marshes near the 

 occupied camps. 



There is much marshy hillside caused by seepage 

 outcrops. The impervious character of the soil 

 enables small depressions to hold water for rela- 

 tively long periods, especially where rank vegeta- 

 tion proves a barrier to evaporation by sun and 



