274 G. CARR ROBINSON AND W, L. GOODWIN ON 
is pale yellow, that of methyl-pentacoline olive-green, of methyl-octacoline 
brilliant orange, &c. 
These*™bodies are sparingly soluble in cold, readily in hot, alcohol; the 
solution exhibiting the fluorescence which is observed in the recently-distilled 
base itself. 
When pure, these iodides of methyl compounds show considerable stability ; 
decomposition, in the case of iodide of methyl-tetracoline, not taking place 
below 190° C. 
Action of Iodide of Methyl on Tetracoline, C,,.H,,N. 
A portion of fraction 290°-295° C., consisting of the base tetracoline, C,,H,,N, 
was mixed with an excess of iodide of methyl (about 1 vol. base to 3 vols. 
iodide), and heated in a sealed tube in the water-bath for thirty minutes. On 
cooling, the semi-solid mass of yellow crystals was thrown on a filter, the excess 
of methyl-iodide filtered off, and the crystals, after being well washed with 
cold alcohol, in which they were very sparingly soluble, were dried at 100° C. 
Analysis showed these crystals to be the iodide of methyl-tetracoline, 
C,,.H,,NCHL,I. 
Analysis— 
I. 0°1855 grms. crystals dried at 100° C. gave— 
0341 4, CO, = 50°13 per cent. carbon. 
O0o7 "EEO o40 , hydrogen. 
Il. 03745 ,,  gave— 
0°69 » CO, = 50:20 per cent. carbon. 
OniSo te SEvO Roo 2 hydrogen. 
III. 03035 ,, gave— 
0:226 ,, AgIl= 40-23 per cent. iodine. 
C,,H,,NCH;I , iodide of methyl-tetracoline, requires— 
Found 
Calculated ooo — SEES, 
i 1 Ill. 
Carbon, : 49°84 50°13 50°20 
Hydrogen, ; S11 5°40 5°60 
Iodine, ; 40°58 eae io 40:23 
Chloroplatinate of Methyl-tetracoline. 
In order to obtain this substance, iodide of methyl-tetracoline prepared 
from fraction 285°-290° C. was dissolved in boiling alcohol. On cooling, a crop 
of minute pale-yellow crystals of the iodide was thrown down. The mother- 
liquor from these was treated with solution of silver nitrate, the iodide of silver 
filtered off, and the excess of silver thrown down by dilute hydrochloric acid. 
