414 Howe and Campbell — Specimens from Yucatan, 



Specimen 1Y2. The amount of water in each of the two 

 specimens was less than 350% precluding the possibility of a 

 full and accurate analysis. This specimen was perfectly clear 

 and without sediment except a little sand. Without odor and 

 with no perceptible taste. Reaction neutral. On evaporation 

 crystals of gypsum began to crystallize out with slight concen- 

 tration. 



Analysis showed the following per liter : 



Ca _ _.. 0-865 grams 



Mg 0-313 



K 0-025 



Na 0-301 



S0,.._ ... 3-361 



CI 0-368 



From this it appears that the principal salt in the water is 

 calcium sulphate with smaller quantities of sodium sulphate 

 and magnesium chloride. 



No other bases or acids were found, and bromine, iodine, 

 strontium, barium, magnesium and iron were shown to be 

 absent by as careful examination as the quantity of water per- 

 mitted. Organic matter was also absent. 



Specimen 1189, water from the middle of the lake, was per- 

 fectly clear when opened, with a slight black rather ilocculent 

 deposit. It had a strong odor of hydrogen sulphide and a 

 somewhat bitter taste. Reaction neutral. As soon as the odor 

 of hydrogen sulphide was detected it was resealed, but before 

 it could be examined (a few hours) it had given a copious 

 deposit of sulphur. 



Hydrogen was then led through the water for eighteen 

 hours, the H,S not precipitated being absorbed in caustic soda, 

 and estimated as As^Sg. The precipitated sulphur was recov- 

 ered as far as possible by extraction with rectified carbon disul- 

 phide in which it was soluble. The amounts from 345"°^ of 

 water are as follows, calculated per liter : 



Hydrogen Sulphide dissolved ._ -01008^'""^= 6*64 



" '' from precipitated sulphur -03942 25-91 



Total hydrogen sulphide per liter -0495s^'''" = 32-55 



Analysis showed the following per liter : 



Ca 0-600 grams 



Mg -- 0-325 



K 0-019 



Na 0-533 



SO, 2-607 



CI 0-362 



ccm 



