APPENDIX. 



vii 



For Packing tJie specimens. — A stock of strong paper.* Sealing-wax. Writing-paper, cut 

 into labels. Thick gum-water, to cement the labels to the specimens.f 



For the Conveyance of specimens. — A large hag of leather, with straps for the shoulders. 

 Strong canvas hags, of smaller size, are very convenient for subdivision and arrangement. — For the 

 protection of crystals, or delicate petrifactions, &c., wool or cotton are necessary ; and small wooden 

 boxes (like those used for holding wafers) are sometimes required. For distant carriage, strong 

 wooden boxes, casks, or baskets. 



The following are either essential, or useful in various degrees, for obtaining and recording 

 observations. 



Pocket Memorandum-Books, of sufficient size to admit sketches. 

 A Pocket Compass. 



A Measuring-tape, of fifty feet, or more. 



A Telescope. 



A Camera Lucida. 



A Box of Colours. 



The best iH/ops should always be sought for : — And, the true economy to the traveller being 

 that which saves time, it is best to mark, or even to colour the map, in the field. Notes inserted on 

 imperfect maps, or deduced afterwards from memoranda, are less authentic ; and the process is 

 frequently neglected. 



Portable-Barometers, with detached thermometers, are desirable ; and the best instruments are 

 ultimately the cheapest. But, unfortunately, barometers of every construction are very easily 

 damaged or deranged. — Minute accuracy, however, in the determination of heights, thougli very 

 interesting to physical geography, is comparatively of little importance to the geologist. 



If the collector be a surveyor, he will know best to what purposes a Pocket Sextant, or a small 

 Theodolite, is applicable : — the measurement of distances, — of heights, — and of the inclination of 

 strata, &c. 



* Strong English brown paper is preferable to any other as no insects wHI attack it. 

 t If paste is used, any essence added to it will preserve it from mildewing. 



