975 



As could be expecle(i llie constituents of the secretions are also 

 found in the ash of the wood of varieties of Tectoiia grandis noi be- 

 longing to (/jatf kapnr. Furthermore, if we reflect that in the sappy 



outer layers of the wood concretions never occur, though their con- 

 stituents aie present, we may safely conclude that there must he 

 some relation between those secretions and tiie decrement of the 

 amount of sap. 



The amount of phosphoric acid in the 3 analyses does not vary 

 cpnsiderably ; there is a difference with respect to calcium- and mag- 

 nesium oxide. A comparative index is given by the analyses of 

 RoMANis, because the heart wood and the sapwood were examined 

 intei- se. With reference to this it should not be forgotten, that the 

 heartwood yielded 1 Vo- ^''^ sapwood only 0.74 '/o of ash. In this 

 way the largei- amount PH)' (31.97 7o) '" the sapwood against 27.42 

 "/, in the heartwood, is only an overestimation, for the wood it is 

 no more than 23.66. In the same way we get 5.44 instead of 7.35 

 " , of CaO and 22.62 instead of 30.57 "/„ of MgO. It will be seen 

 that the CaO-content of the. heaitwood Til. 80 'J is more than twice 

 that of the sapwood (5.44 " „), which readily accounts for the secre- 

 tion of phosphate; it does not, however, point to the causes of this 

 secretion, for they are the rule with djati kapur and the exception 

 witl» other varieties. Apparently softness and less solidity of the wood 

 tissue go together with secretions, which result from them. In the 

 analysis by Tho.ms VII we notice a MgO-content of only 0.94 '/j 



