Note XX — Chapter VII
Reading edition
] This is so very useful in extending the horizon of view, and in enabling you to examine a whole ledge of sunken rocks at once, that it is well worth the trouble of a week or two's practice.
Reading edition
] This is so very useful in extending the horizon of view, and in enabling you to examine a whole ledge of sunken rocks at once, that it is well worth the trouble of a week or two's practice.