A patient and attentive scrutiny will reveal features which at the first view wholly escape notice.
In Plate 6 I have given a series of views of Mars much more distinct than an observer may expect to obtain with moderate powers.

I add a chart of Mars, a miniature of one I have prepared from a charming series of tracings supplied me by Mr.Dawes.The views taken by this celebrated observer in 1852, 1856, 1860, 1862, and 1864, are far better than any others I have seen.

The views by Beer and Maedler are good, as are some of Secchi's (though they appear badly drawn), Nasmyth's and Phillips'; Delarue's two views are also admirable; and Lockyer has given a better set of views than any of the others.

But there is an amount of detail in Mr.Dawes' views which renders them superior to any yet taken.
I must confess I failed at a first view to see the full value of Mr.
Dawes' tracings.

Faint marks appeared, which I supposed to be merely intended to represent shadings scarcely seen.