268 National Geographic Magazine. 



perhaps for models of mounds and subjects of like character, 

 would hardly be applicable to small scale models with fine detail ; 

 such casts require too much surface finishing. The material 

 known as Lincrusta-Walton seems to me to be the ideal material 

 for this purpose. It is tougher than rubber, will take the finest 

 detail, and its surface can be treated in any way desired. Unfor- 

 tunately the manufacture of models in this material would require 

 expensive machinery, and is outside the scope of a modeling 

 room. Should it ever become commercially advantageous, how- 

 ever, casts of a model of ordinary size, in every way equal to the 

 original, can be turned out in this material at a very small cost. 



It remains to speak of the reproduction of models by process- 

 engravings — a method that will probably receive much more 

 attention in the future than it has in the past. It is perhaps 

 along this line that the cheap reproduction of models will develop ; 

 but the subject is too large a one to be adequately treated here, 

 and must be postponed until some future occasion. 



