IN THE WOOD OF THE BEBEERU OR GREENHEART TREE. 571 



was quite white, the other possessed of a light fawn colour. We must remark, 

 that this alkaloid is excessively difficult to burn. In the two first analyses 

 quoted, the substance was burned in the manner now usual with oxide of copper 

 and oxygen gas, taking great care to have a sufficient quantity of copper 

 turnings in the anterior part of the tube. In the third analysis, we used the 

 method proposed by Gintl, one of Rochleder's pupils, and which consists in 

 mixing the substance intimately with fused and powdered bichromate of potash 

 and powdered oxide of copper, and filling up the tube as usual with granulated 

 oxide of copper. Operating with the greatest precaution, the combination was, 

 however, not completed until a very considerable quantity of oxygen gas had been 

 passed through the tube. 



I. 0225 grms. of substance gave 0-139 grms. of water and 0-583 grms. of 

 carbonic acid. 



II. 317 grms. of substance gave 0194 grms. of water and 0816 grms of 

 carbonic acid. 



III. 0-272 grms. of substance gave 0-158 grms. of water and 0-6945 grms. of 

 carbonic acid. 



Nitrogen was determined by Will and Varrenptrapp's method. The ammonia 

 evolved was collected in standard sulphuric acid. 



04015 grms. of substance yielded ammonia, which required for neutralisation 

 1-3 cubic cents, of normal sulphuric acid (1 C.C. corresponded to 0-0177 ammonia, 

 or - 014 grms. of nitrogen). 



These numbers lead to the following per-centage composition : — 



Carbon, 

 Hydrogen, 

 Nitrogen, 

 Oxygen, 



The double compound, with tetrachloride of platinum, was employed in the 

 determination of the atomic weight of the base. 



(1.) 0-2985 grms. of the salt gave 0-053 grms. of platinum = 17'72 per cent, of platinum. 



(2.) 0-259 „ „ 0-046 „ „ = 177 



(3.) 0-1735 „ „ 0-0295 „ „ = 17-0 



(4.) 0-288 „ „ 0-052 „ „ = 18-05 



(5.) 0-329 „ „ 0-06 „ „ = 18-23 



The mean of these five determinations gives the per-centage composition of 

 platinum in the double salt as 17-72, from which we deduce 348*08 as the atomic 

 weight of the alkaloid. From the above numbers, we deduce for our new 

 alkaloid, Nectandria, the formula — 



O 40 H 23 NO 8 (C = 6.) 

 C 20 H 23 NO 4 (C=12.) 

 VOL. XXV. PART II. 7 1 



I. 



II. 



III. 



Mean, 



70-26 



70-19 



69-63 



7002 



6-86 



6-81 



643 



6-73 



453 



4-53 



4-53 



4-53 



18-35 



18-47 



19-31 



18-72 



