Oils and Fats. 



Results of Examination. 

 Specific gravity at 15715= C =0-929. 

 Optical rotation in 100 mm. tube at 

 21-5° C = + 0° 19'. 



"Total alcohols" (geraniol and citro- 

 nellal) = 391 per ceut. * 



Geraniol = 19 '4 per cent. 



OitroneDal = 19 7 per cent. 



Solubility in alcohol : gives a clear 

 solution with its own volume of 80 per 

 cent, alcohol, but becomes opalescent 

 with 10 volumes. 



Remarks.— This oil is derived from 

 ''red-stemmed mana" grass, which has 

 been identified by Dr. Stapf as Cymbo- 

 pogon Nardus, Reudle, var. conferti- 

 fiorus, Stapf, and is therefore identical 

 with the sources of oils No. 8 (?), 6 and 7, 

 The yield in this case was 0'16 per cent. 

 This oil differs from the other oils from 

 the same species of grass in its low per- 

 centage of " total alcohols " and in the 

 fact that geraniol and citronellal are 

 present in about equal proportions. 



No. 8\ 



Quantity : 52 cc. ; distilled August 14, 

 1908. 



Description: Dark-coloured oil with a 

 fairly pungent odour. A small deposit 

 was present in the bottle containing the 

 oil. 



Results of Examination. 

 Specific gravity at 15715° C = 0-909. 



Optical rotation in 100 mm. tube at 



22 s C = + 0" 58'. 



" Total alcohols " (geraniol and citro- 

 nellal) 57-0 per cent. 



Geraniol = 28'9 per cent. 



Citronellal = 28'1 per cent. 



Solubility in alcohol : gives a clear 

 solution with its own volume of 80 per 

 cent, alcohol, but becomes opaloscent 

 and shows a very slight flocculence with 

 10 volumes of the alcohol. 



Remarks. — This oil is from the same 

 source as No. 8. The yield of oil on dis- 

 tillation was almost the same as in the 

 case of No. 8, viz.. 0-15 per cent. The 

 percentage of ''total alcohols" present 

 has largely increased, owing to almost 

 equal increase in the two constituents, 

 geraniol and citronellal. 



No. 9. 



Quantity : 133 cc. ; distilled July 5 and 

 September 26, 1907, 



Description : Yellow oil with a charac- 

 teristic citronella odour. A slight depo- 

 sit was present. 



2 [December, 1910. 



Results of Examination. 

 Specific gravity at 15 /15° O = 0-906. 



Optical rotation in 1 mm. tube at 



22° = + C 3° 7', 



"Total alcohols" (geraniol and citro- 

 nellal; = 57-0 per cent 



Geraniol = 34'4 per cent. 



Citronellal = 22'6 per cent. 



Solubility in alcohol: gives a clear 

 solution with its own volume of 80 per 

 cent, alcohol, but becomes slightly opal- 

 escent with 10 volumes. 



Remarks. — This oil is derived from 

 '* small-leaved mana," identified by Dr. 

 Stapf as Cymbopogon Nardus, Reudle, 

 var. Linncei, Stapf (typicus), which 

 makes it ideutical with grasses Nos. 1, 2, 

 5, 10, 11, and 15 in this series. The yield 

 of oil in this distillation was 22 per 

 cent. 



No. 9\ 



Quantity : 178 cc. , distilled August 19, 

 1908. 



Description : Pale yellow oil with a 

 sharp pungent odour, differing consider- 

 ably from that of No. 9. A small depo- 

 sit was present, including some fibrous 

 material. 



Results of Examination. 



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



Optical rotation in 100 mm, tube at 22° 

 C= + 3' 20'. 



"Total alcohols" (geraniol and citro- 

 nellal) = 56'3 per cent. 



Geraniol = 36*5 per cent. 



Citronellal = 19-8 per cent. 



Solubility in alcohol : gives a clear 

 solution with its own volume of 80 per 

 cent, alcohol, but shows a very slight 

 opalescence with 10 volumes. 



Remarks.— This oil is from the same 

 source as No. 9. It shows a slight 

 increase in geraniol as compared with 

 No. 9, and a slight decrease in citronellal. 

 The yield of oil in this distillation was 

 0'33 per cent. 



No. 10. 



Quantity : 88 cc ; distilled June 30 and 

 September 27, 1907. 



Description: Rather dark oil with a 

 peasant odour. A small deposit was 

 present, including some red flocculent 

 matter. 



Results of Examination. 

 Specific gravity at 15715° C = 0'935. 

 Optical rotation in 1 mm. tube at 20'= 

 + 16° 0". 



" Total alcohols " (geraniol and citro- 

 nellal) = 35 "3 per cent, 



