[335], l. 10, for “two velocities,” read “low velocities.”

[336], last l., for “entering part,” read “entering port.”

[341], l. 11, for “properties,” read “proportions.”

[341], last l., for “Nollan,” read “Nollau.”

[346], l. 17, for “part,” read “port,” and for “construction,” read “contraction.”

[355], l. 7, for “6300,” read “5170”; and l. 9, for “16,905,” read “15,775.”

[363], l. 17, for “44 × 2 = 80,” read “44 × 2 = 88.”

[363], l. 18, for “54½ × 3 = 103½,” read “54½ × 3 = 163½.”

[367], l. 16, for “15.0
10,” read “15.0
16,”

[368], l. 15, for “u = 135,” read “n = 135,” etc.