8o4 NORTH AMERICAN INDEX FOSSILS. 



them. Never use a hammer' as a chisel, for flying chips of steel 

 are a source of grave danger. 



{d) Lens. — A pocket lens of large field, preferably double or 

 triple, is almost indispensable ; the single lens should be of low 

 power. 



{e) Note Book and Pencil. — No field worker or scientific collec- 

 tor ever goes into the field without a note book. A hard cover is 

 desirable, on the inside of one of which a paper protractor may be 

 fixed for a clinometer, with a string and button for indicator. It 

 will be found useful, if much ground is to be covered, to tie the note 

 book to the belt or button-hole and the pencil to the note book, 

 allowing in each case a sufficient length of loose string for ready 

 use. Note books and pencils are easily lost and cannot be replaced 

 in the field. Always have your name and address in the front of 

 the book. 



(/) Colored Pencils. — A set of colored pencils will be found 

 most useful in making sections of the regions studied. It is best 

 to carry these in a small canvas or leather pocket divided after the 

 manner of a cartridge belt, each pencil being in a separate tight- 

 fitting compartment. On the back of the pocket may be several 

 loops for attaching it to the belt. The pencils then are always at 

 hand, and the proper color is quickly selected. 



{g) Labels. — A small pad (2x3 inches) of paper, preferably 

 colored, for labels is necessary, and should never be omitted. 



{h) Wrapping Paper and Twine. — Never go into the field with- 

 out a sufficient supply of old newspapers. Manila wrapping paper 

 for packages, or a supply of paper bags of various sizes obtainable 

 at any grocery store, are necessary for proper packing of col- 

 lections. 



{i) Boxes, Cotton Batting, etc. — A number of assorted boxes, 

 from pill boxes to cigar boxes are needed in collecting large quan- 

 tities of delicate weathered-out material. Cotton batting is like- 

 wise indispensable for this purpose. 



B. Field Work. 

 {a) Collecting. — The natural exposures of fossiliferous rocks on 

 hill sides, in river gorges and ravines, and the artificial exposures 

 in railroad cuts, quarries, etc., are the hunting grounds of palaeon- 



