rity 
“SCIENTIFIC AND. OTHER NOTES ON ESSENTIAL Os 27 
‘ ‘The same_ Zee to another oil, which made itself conspicuous by its high 
P specific gravity and also had a disagreeable odour, reminding us somewhat of amber oil. 
_ In this case, the quantity at our ae, was so small, that we were unable to prove 
other irregularities. 
For curiosity’s sake, we . would mention a so-called lemon oil from Chemnitz (Saxony). 
_ The only similarity was in the colour, for this “oil” consisted otherwise only of water. 
Eee Great caution in buying terpeneless lemon oil is recommended by W. Scholvien’), 
who writes as follows: “It must be pointed out as a warning that of late so-called sesqui- 
_terpeneless lemon oil (30fold strength) has been offered at -Z 2400.— per kilo and 
_ apparently sold on a fairly large scale. The article in question is grossly adulterated, 
the specific gravity being "1.07 (against 0.90 to 0.91”) for a normal quality), owing most 
‘likely to the addition of a heavy ester. Even a layman can easily prove this falsification, 
as such an oil sinks in water, whereas the normal product would float.” 
thing to do with it, this product now noe a favourite adulterant, as‘a good number 
of instances in this Report testify. 
{ We believe we are not mistaken in supposing that phthalic acid ester has some- 
4 
E: behaved singularly, as follows: diso0 0.8528, %p0 + 82° 54’, Ce of the first 10 per cent. 
it is true, is within the correct limits, but the optical rotation ought to be between 
+ 95°30’ and + 98°, being the same, or but a trifle lower, for the first 10 per cent. 
of the distillate. Besides, the residue after evaporation was suspicious, being viscous 
instead of waxlike. The only explanation for these deviations is that either the oil 
this nature, which one met rather often in the last few years, will soon be great rarities. 
J. A. Liems*) has published an article on the cultivation of “agrwmen” fruits in 
Surinam, according to which it is remunerative and seems to have a promising future. 
quality. Apparently no oil bas been manufactured there, so far. 
There are no further details in the discussion at our disposal. 
Diseases of “agrumen” trees. — We have already several times aquainted our readers 
_ with diseases of the cultivated Citrus species*) and wish in this connection to mention 
periodical’). The disease has been observed for the first time in California. It was 
_ found to be due to a bacterium, to which the name Bacterium citrarefaciens was given, 
_ whereas the disease itself received the name of Citrus Blast. Infection is chiefly 
confined to new spring growth or unseasoned wood of the previous year, and occurs 
specially at the junction of the petiole and blade of the leaf. The tips of the very 
young leaves and tender shoots are also easily affected. The infected leaf turns pale 
yellow, then darkens irregularly in spots, wilts, shrivels and finally dries. Once established, 
_ the disease rapidly progresses towards the older wood, although this is more resistant. 
__ The young shoots are often killed back to the older wood, including part of the bark 
- 4) Deutsche Destillateur-Ztg., 40 (1919), 354. — °) These figures seem to be based on E. Bécker’s notes 
On terpeneless and sesquitcrpeneless lemon oil in the “Wallach-Festschrift” (Gottingen 1909, p. 228). He there 
= 
van het Department van den Landboww; Perfwm. Record 9 (1918), 296. —  *) Comp. Reports October 1915, 65, 
_ October 1916, 99: — +) Agricultural News; Perfum. Record 9 (1918), 178. 
Orange Oil, sweet. We received from Wiesbaden a sweet orange oil which . 
of the distillate +- 76°14’, residue after evaporation 2.9 per cent. The specific gravity, 
In the main, oranges are cultivated, the fruit obtained being of very good marketable ~ 
- a notice on a new bacterial disease of certain such trees, published in an English 
indicates 0.895 to 0.909. We have observed lower values, sometimes, with our own products. — 3) Bulletin: 
-was grossly adulterated or an artificial product. It is to be hoped that substitutes of 
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