And these labels should be connected with the specimens immediately, on the spot where they are found.

This injunction may appear to be superfluous; but so much valuable information has been lost to geology from the neglect of it, that every observer of experience will acknowledge its necessity; and it is, perhaps, in practice one of the most difficult to adhere to.
11.

A sketch of a coast or cliff, however slight, frequently conveys more information respecting the disposition and relations of rocks, than the longest memorandum.

If numbers, denoting the situation of the specimens collected, be marked upon such sketches, much time may be saved at the moment of collecting.

But in all such cases, the memorandum should be looked over soon afterwards, and labels distinctly explaining their situation, etc., be attached to the specimens themselves.
12.