508 TAKNING SUBSTANCES. 



those of picked Morea, 10 per ton. The duty received on 

 valonias imported in 1842 was about 4,000. 



The annual produce is sufficient to meet the wants of all Europe. 

 It can be had in Turkey to any extent and at all periods. Many 

 cargoes are sent to Dublin, and the German markets. A little 

 valonia is exported from Manila, the shipments having been about 

 150 tons per annum. 



Camata and Camatina are two varieties of very young valonias, 

 which are found more valuable for some processes of tanning than 

 the common kinds. 



Extensive as has been the enumeration of the vegetable sub- 

 stances used in the various branches of art and manufacture which 

 have formed the principal subjects of this section, it is probable 

 that with the progress of knowledge, of scientific experiment, and 

 of investigation into the properties of given commodities, the list 

 will be indefinitely increased. "What I have stated will suffice 

 to give the reader an idea of the surprising variety of sources 

 from which we receive the raw materials which enable us to perfect 

 some of the most elegant processes of manufacturing skill and 

 ingenuity, and will further afford some criterion though, of 

 course, not a perfect one for estimating the relative importance 

 of the tanning and dyeing substances. 



