SYMBOLS FOE CHARTS OF PRE-IIISTORIC ARCII.T::0L0GY. 231 



Second category — Xumher of monuments. — This category embraces cer- 

 tain sigus placed like the expouents in matliematics at the side of the 

 principal, on the right of the upper part. If the number of objects is 

 knowu, it may be expressed in ligures; if not, the sign iilus is used to 

 denote plurality, and the double plus to mark a great number. 



Several. Many. Definite number. 



VY (J \\ ^ Artificial sepulchral grottoes. 



^17* x:z^'^'^ «^37 9 Mardelles. 



\^9_r * \±J'^ \_£V27 Burials by iucincration. 



Third category — Age of the monuments. — In fact, the respective ages 

 of mouuments should be denoted by different colors, as we shall see in 

 the following chapter. Where prehistoric facts can be indicated by one 

 color only, because labor is an item, or because the symbols are to be 

 placed on a general chart, or because the different colors arc used to 

 indicate historic epochs, political and administrative divisions, geolog- 

 ical strata, &c., it is necessary to add certain complementary sigus, 

 which are to determine the age. 



r Palaeolithic age. 



\ Neolithic age. 



T Bronze age. 



9 Iron age. 



As may be seeu, these signs proceed from the most simple to the more 

 complex, as civilization advances. They are to be placed on the raiKcals 

 or the derivatives; or two or three of them maybe grou])ed upon a 

 symbol belonging to two or three different ages, as a cavern wherein are 

 found palajolithic and neolithic remains, and implements of bronze. 



Palajo- 



lithic. Xeolitliic. Bronze. Iron. 



A A A A^^ 



Cavern. 



iud. 

 Station. 



In case where the age is uncertain, the interrog;ition point may bo 

 added. As to the position of the finds in lakes, turbaries, mountains, 

 plains, forests, &c., we need not make any provision, since the topo- 

 graphical signs already in use furnish these indications. 



