GUANJCASTE— SANTA CRUZ 461 



A second species of monkey seen to-day, the " cara blanca " 

 or capuchin, is smaller, dark brown with white face and 

 throat. We came upon half a dozen on the ground, although 

 they speedily took to the trees. We enjoyed seeing them 

 swing by limbs or tail from branch to branch, or leap across 

 an open space. Sometimes one would pause upon a bough 

 and stand upright to look at me and then jump up and down 

 two or three times in the same place as captive monkeys 

 often do, apparently in excitement. I lingered for some 

 time to watch their amusing antics. 



After walking some three miles through this forest we 

 crossed a potrero and entered another piece of timberland 

 where the soil was blacker and in drying had cracked into 

 polyhedral masses. A mile or so more brought us to a swamp, 

 locally known as "Laguna Garzal," which was said to ex- 

 tend to the Rio Caiias (or de las Caiias). As far as we could 

 see, most of this swamp was then not open water but covered 

 with coarse grass, sedge and a spiny leguminous shrub about 

 three feet high. At the corner where we emerged was a 

 small area of open water of an irregular L-shape, whose 

 greatest length might have been twenty feet. The water 

 here was widely known in this part of the country because 

 it was said to be warm throughout the year, and it was the 

 object of to-day's excursion to visit it. We had brought 

 with us the school thermometer (" Hachette & Cie, Paris") 

 from Santa Cruz and with it obtained the following results : 

 temperature of the air in the sun, 11.30 A. M., 45° C. ( =113° 

 F.); temperature of the (unshaded) water, 11.35 ^- M., 

 40° C. ( =104° F.); temperature of the air in the shade of 

 the nearest trees, 1.30 P. M., 30° C. ( =86° F.). The sun 

 shone brightly all day. At almost all times bubbles could 

 be seen rising at one spot or other from the floor of this 

 pool, which was a fine, slightly greenish mud. The water 

 was quite clear. We all drank a little, to which we added a 



