642 J enkins-^-S potted Lakes of Epsomite in 



needed no further attention save pulverizing and packing. 

 All of it was graded and packed in such a way that it 

 would not deteriorate through loss of its water of crystal- 

 lization. The reprecipitated crystals were dried first 

 with a great deal of care. 



The large lake, which lies in Canada, is about seventy 

 acres in extent. Its depth and structure were not yet 

 determined when the writer visited the place, but its sur- 

 face appearance was much like that of the smaller lake. 



Fig. 5. 



Fig. 5. — Same spotted lake as that in fig. 1. 

 after the rainy season. 



This photograph was taken 



At that time the first work was being done — that of 

 removal of the salts from the shallow pools. The brine 

 itself in the pools was so strong that it was very heavy 

 and very slimy like the white of an egg, and had an offen- 

 sive odor. The work was accomplished by shoveling the 

 salts into wheelbarrows, wheeling them along planks laid 

 down on the mud, and dumping their contents upon 

 platforms on the shore. 



The writer was told that seasonal changes, and even 

 the daily changes of temperature, noticeably affect this 

 lake. After the rainy season the spots are nearly hidden 

 beneath the surface of the water covering. In the later 

 part of the summer the brine of the lake is quite concen- 

 trated and during cool nights the salts crystallize out of 

 the warmer daytime solution. 



