December, 1910.] \ 



Optical rotation in 100 mm. tube at 

 22-5° C = — 3° 20'. 



" Total alcohols " (geraniol and citro- 

 nellal) = 47 "7 per cent. 



Geraniol = 25*8 per cent. 



Citronellal = 21*9 per cent. 



Solubility in alcohol : gives a clear solu- 

 tion with 1*4 volume of 80 per cent, al- 

 cohol ; becomes slightly turbid with 2 

 volumes. The addition of 10 volumes of 

 the alcohol causes a marked turbidity. 



Remarks — This oil is from the same 

 source as No. 2. It is richer in " total 

 alcohols " than No. 2, the increase being 

 due mainly to the higher percentage 

 of citronellal present. The yield of oil 

 in this distillation was 0*10 per cent. 



No. 2**. 



Quantity : 107 cc, ; distilled August 26, 

 1908. 



Description : Pale yellow oil similar in 

 odour to No. 2*. A slight non-crystalline 

 deposit was present in the bottle contain- 

 ing the oil. 



Results of Examination. 



Specific gravity at 15°/15° C = 0-909. 



Optical rotation in 100 mm. tube at 22° 

 C = + 2° 6'. 



" Total alcohols " (geraniol and citro- 

 nellal) = 53*5 per cent. 



Geraniol = 30 per cent. 



Citronellal = 23*5 per cent. 



Solubility in alcohol : gives a clear 

 solution with its own volume of 80 per 

 cent, alcohol, but shows a slight opal- 

 escence with 1C volumes of the alcohol. 



Remarks. — This oil is from the same 

 source as Nos. 2 and 2*. This is the best 

 of the three oils from " heen-naran-pen- 

 giri" grass and approaches " maha-naran- 

 pengiri" oil No- 1 in composition, contain- 

 ing a little more geraniol and slightly 

 less citronellal. The yield of oil in this 

 case was 0'25 per cent. 



No. 3. 



Quantity : 74 cc. ; distilled July 3 and 

 September 21, 1907. 



Description : Deep yellow oil, with a 

 pleasant, not very pungent odour. A 

 small non-crystalline deposit waspresent. 



Results of Examination. 



Specific gravity at 15715° C = 915. 



Optical rotation in 100 mm. tube at 22° 

 C = + 2° 46'. 



" Total alcohols " (geraniol and citro- 

 nellal) = 52*0 per cent. 

 Geraniol = 31*1 per cent. 

 Citronellal = 20*9 per cent. 

 62 



) Oils unci Fats. 



Solubility in alcohol : gives a clear 

 solution with l'l volume of 80 per cent, 

 alcohol, but becomes very slightly opal- 

 escent on the addition of 10 volumes of 

 the alcohol. 



Remarks, — The oil is derived from a 

 grass known as " leua-batu-pengiri " in 

 Galle, but not regarded as true " lena- 

 batu-pengiri " (see No. 4). It has been 

 identified by Dr. Stapf as Cymbopogon 

 Nardus, Reudle. approaching var. con- 

 fertiflorus, Stapf. The yield in this dis- 

 tillation was 0"17 per cent. 



The oil from this grass generally resem- 

 bles that of " maha-naran-pengiri " (Nos. 

 1, 1*, and 1**), in the percentage of "total 

 alcohols," but No. 3* is much richer in 

 geraniol and poorer in citronellal than 



No. r\ 



No. 3* 



Quantity : 103 cc. ; distilled May 9, 1908. 



Description: Pale lemon-yellow oil, with 

 a good citronella odour, rather more 

 pungent than that of No. 3. A slight 

 deposit was present. 



Results of Examination. 



Specific gravity at 15°/15° C -= 0"902. 



Optical rotation in 100 mm. tube at 20° 

 C = — 2° 11'. 



Geraniol = 39'5 per cent. 



Citronellal = 23"6 per cent. 



Solubility in alcohol : gives a clear solu- 

 tion with its own volume of 80 per cent, 

 alcohol, but becomes slightly opalescent 

 with 10 volumes of the alcohol. 



Remarks.— This oil is from the same 

 source as No. 3. It is very similar as 

 regards the percentage'! of geraniol and 

 citronellal present to No. 1* derived from 

 " maha-naran-pengiri." The yield of dis- 

 tillate in this case was 0*10 per cent. 



No. 3**. 



Quantity : 91 cc. ; distilled August 

 22, 1908. 



Description : Pale lemon-yellow oil, 

 similar in odour to No. 3*. A slight non- 

 crystalline deposit was present. 



Results of Examination. 



Specific gravity at 15°/15° C = 0-907. 



Optical rotation in 100 mm. tube at 

 21-5° C = -0° 6' 



"Total alcohols" (geraniol and citro- 

 nellal) = 04'2 per cent. 



Geraniol = 44'8 per cent. 



Citronellal — 19'4 per cent. 



Solubility in alcohol : gives a clear 

 solution with its own volume of 80 per 

 cent alcohol, but becomes opalescent 

 with 10 volumes of the alcohol. 



