118.

120.

147.

152.

156.

173.

176.

15 for a2yy+b2xx′=a2b2 read a3yy′+b2xx'=a'2 b'2.

b

19 for √ {} read√/{~-~~~~}.

4 from bottom, for MA read 2 MA.

2 for CX read CY.

8 from bottom, for -2ax read +2 ax.
3 from bottom, for fig. 63 read fig. 66.
11 from bottom, for fig. 64

184. 4 from bottom, for fig. 66

read fig. 67.

read fig. 70.

1