Errata. 
Page 61: Proportion of sodium carbonate in solution 
#3 should be 1.2045 grams and not 0.12045 grams. 
Page 91: The indicated scale of the map on this page 
is incorrect. The correct scale is 4.9 miles to the inch. 
From this the greatest length of the lake is 40.4 miles 
(65 km.) with a shore line of 103 miles (166 km.). This 
corrects the measurements given in the text at top of 
page 91. 
Page 94: The indicated scale of the map on this page 
is incorrect. The correct scale is 2.36 miles to the inch. 
From this the greatest length of Priest Lake is 18.5 miles 
(30 km.) with a shore line of 48 miles (77 km.). This 
corrects the measurements given in the text at bottom of 
page 92. 
