Oils and Fats. 



Remarks. — The grass yielding this oil 

 is " Lena-batu-pengiri," which has been 

 identified by Dr. Stapf as Cymbopogon 

 Nardus, Rendle. Lena-batu. This grats 

 is the usual source of Ceylon citronella 

 oil, but the present sample of oil is 

 below the usual Ceylon standard in the 

 percentage of geraniol present, and 

 above it as regards citronellal. Com- 

 pare No. 4, which is derived from the 

 same species. The yield of oil on distil- 

 lation in this case was 0"46 per cent. 



No. 12*. 



Quantity : 285 cc, ; distilled July 27, 

 1908. 



Description : Clear light-yellow oil, of 

 characteristic citronella odour. No de- 

 posit was present in this instance. 



Results of Examination. 



Specific gravity at 15 /15° C = 0*915. 



Optical rotation in 100 mm. tube at 

 21° C = 14° 16\ 



" Total alcohols " (geraniol and citro- 

 nellal = 61 "3 per cent. 



Geraniol = 34 "5 per cent. 



Citronellal = 26"8 per cent. 



Solubility in alcohol : gives a clear 

 solution with its own volume of 80 per 

 cent, alcohol, but shows a slight opal- 

 escence when mixed with 10 volumes of 

 the alcohol. 



Remarks.— This oil is from the same 

 source as No. 12. It is of about the 

 same quality as medium citronella oil of 

 commerce from Ceylon. The yield of 

 oil on distillation in this case was 0*56 

 per cent. 



No. 14. 



Quantity : 485 cc ; distilled June 11, 

 1907, 



Description : Golden-yellow oil with a 

 pleasant, not markedly pungent, odour. 

 A slight deposit was present. 



Results of Examination. 



Specific gravity at 15715° C = 0-890. 



Optical rotation in 100 mm. tube at 

 20° C = —2' 45'. 



" Total alcohols " (geraniol and citro- 

 nellal) = 79-0 per cent. 



Geraniol = 32*5 per cent. 



Citronellal = 46'5 per cent. 



Solubility in alcohol : gives a clear 

 solution with 1'2 volume of 80 per cent, 

 alcohol, and remains clear with 10 

 volumes. 



Remarks.— The source of this oil is 

 " maha-pengiri " or "Winter's grass," 



4 [December, 1910. 



Dr. Stapf approves of Mr. Jowitt's 

 suggestion that this grass should at 

 present be considered a separate species, 

 under the name Cymbopogon Winter- 

 tanus, Jowitt. The yield of oil in this 

 distillation was 0*59 per cent. 



The composition of this oil, as com- 

 pared with the other oils from citronella 

 grasses in this series, affords further 

 evidence in favour of the view that this 

 grass is a distinct species. The oil 

 resembles in composition the citronella 

 oil produced in Java and the Feder- 

 ated Malay States, but is rather below 

 them in the amount of citronellal 

 present. 



No. 14a. 



Quantity : 270 cc. ; distilled November 

 2, 1907. 



Description : Quite clear, almost colour- 

 less oil, having a fine citronella odour. 

 No deposit was present. 



Results of Examination. 



Specific gravity at 15715° C = 0-887. 



Optical rotation in 100 mm. tube at 

 22° C = —3° 24'. 



"Total alcohols" (geraniol and citro- 

 nellal) = 84'8 per cent. 



Geraniol = 24'1 per cent. 



Citronellal = 60-7 per cent. 



Solubility in alcohol : gives a clear 

 solution with 1*1 volume of 80 per cent, 

 alcohol, and remains clear with 10 

 volumes. 



Remarks.— See remarks on No. 14. The 

 yield of oil in this distillation was 077 

 per cent. This sample is of practically 

 the same composition as the best Java 

 and Federated Malay States citronella 

 oils imported to the United Kingdom. 



No. 14*. 



Quantity : 280 cc. ; distilled August 29, 

 1908. 



Description : Quite clear, almost colour- 

 less oil. The odour was good, but rather 

 more pungent than in the case of Nos. 14 

 and 14a. No deposit was present. 



R esults of Examination. 



Specific gravity at 15°/15° C = 0'887. 



Optical rotation in 100 mm. tube at 

 21° C = — 2° 56'. 



" Total alcohols " (geraniol and citro- 

 nellal) = 83'5 per cent. 

 Geraniol= 30'9 per cent. 

 Citronellal = 52'6 per cent. 



