"The best mode of exciting the love of observation is by teaching 'How to Observe.' With this end it was originally intended to produce, in one or two volumes, a series of hints for travellers and students, calling their attention to the points necessary for inquiry or observation in the different branches of Geology, Natural History, Agriculture, the Fine Arts, General Statistics, and Social Manners. On consideration, however, it was determined somewhat to extend the plan, and to separate the great divisions of the field of observation, so that those whose tastes led them to one particular branch of inquiry might not be encumbered with other parts in which they do not feel an equal interest."

The preceding passage is contained in the notice accompanying the first work in this series—Geology, by Mr. De la BÈche, published in 1835. Thus, the second work in the series is in continuation of the plan above announced.