73 



The following summary of the tannin content in the bark of each species of 

 CaUitris, gives their comparative values for tannin purposes, and shows, at the 

 same time, what a very valuable asset Australia has in some of these Callitris barks, 

 and also indicates their usefulness towards furthering a very important industr}-. 

 The extent of the distribution of the Northern New South Wales species, 

 C. arenosa, is not at present known, but it is possible that extensive areas of it will 

 be found to exist in Southern Queensland, as well as in Northern New South 

 ^\■ales. 



The description of the several barks, together with the results of their 

 analyses, will be found under their respective species in this work. 



Table, giving percentages of tannin in the air-dried Callitris barks, and thus 

 indicating their relative values for tanning purposes. 



Name. 



Localitv and date of coUeciion. 



Percentage of tannin 

 in the air-dried barks. 



C. calcarata 



Do 



Do 

 Do 

 Do 



Warialda, N.S.W., June, 1909 



Do inner "rossed" bark 



Woodstock, X.S.W., May, 1907 



Do cold-water extraction 



Grenfell, N.S.W., March, 1909 

 Wellington, X.S.W., September, 1903 

 Wyalong, N.S.W., July, 1909 



iS 

 25 



■93 per cent. 



•10 



•17 



•81 



•98 



•II 



•19 



c. 



arenosa 



Ballina. X.S.W., June, 1909 ... 



25-10 



)J 







Do inner " rossed " bark 



34 "77 



TJ 







Do inner bark \)\ cold-water extraction 



28-50 



1) 



c. 



glaiica 



Narrandera. N.S.W., March, 1909 



14-68 







Do 



Narrandera, K.S.W., April, 1907 



Do bv cold-water extraction 



14-60 

 10-25 







Do 



Narrabri, N.S.W., June, 1909 



10-52 



„ 







Do inner •■rossed" bark 



12-79 



J) 



C. verrucosa 

 C. gracilis 

 C. rhomboidea 

 C. Muelleri 

 C. rob list a 

 C. intratropica 

 C. propinqiia . 

 C. Tasmanica . 



Shuttleton, X.S.W., 1903 

 Rylstone, X.S.W., 1905 

 Sydney, X.S.W., 1907 

 Sydney, X.S.W., 1907 

 West Australia, 1903 ... 

 Port Darwin, 1903 

 South Australia, 1909... 

 Tasmania, 1909 



8-40 

 12-29 



4-00 

 11-90 



8-66 

 10-72 

 12-63 

 17-36 



The following table gives the general reactions obtained with the aqueous 

 extracts of the several species. The strength was that given by 25 grams 

 air-dried bark per litre. The reactions with the iron salts were determined with 

 averv much more diluted solution. 



