245 



Conclusions from the general analytic data — All of the 



preceding analytic results make it evident that the chemical 

 differences existing among these logwoods are quantitatively very 

 slight. They also make it appear probable that the variations in 

 the different samples of the wood are chiefly variations in the 



Figure I. Seedliugs of logwood, one year old. a. " red logwood."' b, "bastard 

 logwood." Both grown from seedR obtained from "Old Hope" p aotation, Jamaica. 



chemical characteristics of the pigments themselves, which as is well 

 known, possess as a rule high tinctorial qualities even when they 

 occur in only very small amounts. Our results in this connection 

 would also indicate that there are no striking structural differences 

 among these varieties of logwood. They suggest, likewise, that 

 even metabolic tendencies in these logwoods are essentially the 

 same, varying only, perhaps, in the course of events which involve 

 relatively slight quantities of pigment.* 



Tinctorial differences. -The foregoing results having 

 shown that the differences among these logwoods were chiefly if 



•Tbese conclusions are in harmony with those drawn from other etandpoimts by 

 ProfesKor Karle (quoted on page 242). They were nrrived at independently by us and 

 were included in our report, in December, 1902, to the Hotiinical Society of America be- 

 fore we were aware of Profesnor Earle's deductions. . Science, II. 17 : 338. 1903. 



