— 50 — 
as having been obtained from Andropogon Schoenanthus , but it has 
such a pronounced odour of lemongrass oil, that we have no hesitation 
in calling it by thai name. It compares favourably with the Antigua 
oil by its considerably higher aldehyde-content (83,5 per cent., against 
48,2 per cent, for the other) but it shares with the latter its insolubility 
in 70 and 80 per cent, alcohol; 90 per cent, and absolute alcohol 
form at first a clear solution, but when more is added, they cause 
strong turbidity. In its physical constants the oil does not show any 
specially great differences from those observed at other times; we 
found d-^go — 0,8922, (100 mm) = — 0° 9^, and nj)2o° — ^^4^ ^^5- 
Oil of Leptospermum scoparium. C. E. Atkinson describes 
the essential oil of this shrub, which is called manuka by the natives 
of New Zealand, as a brown liquid having an aromatic odour and an 
acrid astringent taste. Its yield is but small. The physical constants 
are as follows: specific gravity 0,916 (12°), congealing point — 17°. 
It boils between 223° and 280°, chiefly about 260°. 
Linaloe Oil. The supplies from Mexico in recent times have been 
totally insufficient, and moreover now and then of unreliable quality. 
The prices have advanced by several marks. The export in igoi 
amounted to 1 2 2 1 2 kilos. 
Oil of Sweet Marjoram. In our Report of October 1902 we 
gave on page 51 an abstract from a work by Genvresse and 
Chablay on the constituents of oil of sweet marjoram. Shortly after 
the publication, Professor Genvresse wrote to us that the oil, which 
he had believed to be oil of sweet marjoram, was not obtained at 
all from Origanu7n Majoi^ana ^ but from Calamintha Nepeta, a plant 
distributed in the Mediterranean countries, which also belongs to the 
labiates, and which in the South of France is wrongly designated 
as marjoram. We have now before us a detailed publication 2) by 
the two above-mentioned authors, in which they specially refer to 
this matter. 
As we have already mentioned, calamintha oil contains a small 
quantity of 1-pinene, a hitherto unknown ketone C^oHj^gO, to which 
the name calaminthone has been given, and, in the portions boiling 
about 225°, pulegone. Calaminthone boils under 745 mm pressure at 
208° to 209°, and at 20° has the specific gravity 0,930. The oxime 
produced from it melts at 88° to 89°, and in ethereal solution com- 
bines with dry hydrochloric acid gas into an addition-product melting 
at 165°; the melting point of the semicarbazone lies at the same 
^) Pharm. Journ. 69 (1902), 369. 
2) Compt rend. 136 (1903), 387. 
