ERRATA IN THE FIRST EDITION. 



A, page 7, line below the title, instead of (32 + ^ a: ) read (32 -f f x). 



A, " 21, on the line beginning with 30, in the last four columns, 



instead of 100.75 100.97 101.20 101.42 

 read 10085 101.07 101.30 101.52. 



B, " 7, on the line beginning with 23, second column, instead of 20.410, read 20.888. 

 B, " 23, on the line beginning with 12, third column, instead of 5.87, read 5.37. 



B, " 30 - 32, at the head of each first column, Temperature of the Air, add " in Centigrade degrees." 

 B, " 40, Table II., first part, on the line beginning with 60, column headed 7, instead of 24.11,01, 



read 24.9,01. 

 B, " " Table II., first part, on the line beginning with 70, column headed 5, instead of 27.4,47, 



read 27.8,47 ; and column headed 8, instead of 28.11,77, read 28.9,77. 

 B, " " Table II., second part, on the line beginning with 70, column headed 5, instead of 328.47, 



read 332.47. 

 B, " 41, Table III., line beginning with 20, the five last columns, 



instead of 63.54 66.08 68.62 71.16 73.70, 



read 63.50 66.04 68.58 71.12 73.66. 



B, " " Table III, line beginning with 200, column headed 3, instead of 515.11, read 515.61. 

 B, " 42, Table V., line beginning with 180, column headed 7, instead of 516.21, read 506.21. 

 B, " 43, Table VI., first part, on line beginning with 70, column headed 2, instead of 76.635, read 



76.735. 

 B, " " Table VI., second part, on line beginning with 7, the last eight columns, 



instead of 0.6483 0.6572 06661 06750 0.6839 0.6927 0.7016 0.7105, 



read 0.6395 0.6483 0.6572 06661 0.6750 0.6839 0.6927 0.7016. 



B, " 43, Table VI., second part, on line beginning with 12, column headed 5, instead of 1.1018, 



read 1.1102. 



C, " 11, on line beginning with 26.5 inches, column headed 6, instead of 674.41, read 674.61. 

 C, " " on line of 27.1 inches, column headed 1, instead of 688.38, read 688.58. 



C, " 12, on line of 30.5 inches, column headed 2, instead of 778.20, read 775.19. 



C, " 39 and 41, at the head of table, instead of " Tenths of Degrees," read " English Inches." 



I), " 28, 29, and 30, head of page, instead of " Tenths of a Degree," read " Hundredths of a Degree." 



D, " 35, note at the bottom, instead of " Geology," read " Geodesy." 



D, " 36, on line beginning with 160, columns headed 8 and 9, instead of '550.19 and 553.47, 



read 551.19 and 554.47. 



D, " 36, on line beginning with 260, columns headed 2, 3, 5, and 6, 



instead of 860.59 863.87 879.43 882.72, 



read 859.60 862.88 869.44 872.72. 



D, " 37, on line beginning with 620, column headed 4, instead of 2048.28, read 2047.28. 



D, " " " " " 770, " 0, " 2526.39, " 2526.29. 



D, " 38, . " " " 880, " 5, " 2903.69, " 2903.60. 



D, " " " " " 890, " 6, " 2939.79, " 2939.69. 



D, " " " " 930, " 5, " 3069.64, " 3067.64. 



D, " " " " 990, " 4, " 3261.71, " 3261.21. 



D, " " " " " 990, " 5, " 3264.59, " 3264.49. 



D, " 39, on line beginning with 1380, columns headed 3, 4, 5, 6, 7, 8, 



instead of 4537.28 4540.56 4543.85 4547.13 4550.41 4553.69, 

 read 4537.48 4540.76 4544.05 4547.33 455061 4553.89. 



D, " 40, on line beginning with 1610, column headed 5. instead of 5292.65, read 5298.65. 



D, " 44, Table X., on line beginning with 3, column headed 6, instead of 21.0205, read 23.0205. 



D, " 45, Table XII., on line beginning with column 0, column headed 5, instead of 0.83333, read 

 0.08333. 



