December, 1910.] 



Geraniol = 16*3 per cent. 



Citronellal = 19'0 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 irom 

 "Sour Mana" grass, identified by Dr. 

 Stapf as Cymbopogon Nardus, Rendle, 

 var. Linncei, Stapf (typicus). The yield 

 of oil on distillation in this instance was 

 0*15 per cent,, which is low. The oil is 

 of poor quality, containing only 35-3 

 per cent, " total alcohols." It is worth 

 noting in this connection that Dr. Stapf 

 has observed that this grass, as re- 

 presented by the herbarium specimen 

 sent to him, appears to be a slightly 

 deteriorated form. 



No. 10*. 



Quantity : 18 cc. ; distilled July 31, 1908. 



Description : yellow oil, the odour of 

 which is quite different in character 

 from that of No. 10, and resembles some- 

 what that of the oil of C. polyneuros 

 (see Nos. 16 and 16*). A slight deposit 

 was present. 



Results of Examination. 



SpeciEc gravity at 15715° O =0-967, 



Optical rotation in 100 mm. tube at 20 

 G = + 15° 50'. 



"Total alcohols " (geraniol and citro- 

 nellal) = 26-9 per cent. 



Geraniol =6"3 per cent. 



Citronellal = 20*6 per cent. 



Solubility in alcohol : gives a cleat- 

 solution with its own volume of 80 per 

 cent, alcohol, but becomes turbid with 

 10 volumes. 



Remarks. — This oil is from the same 

 source as No. 10. The yield of oil on 

 distillation was 04 per cent., which is 

 the lowest yield obtained iu this set of 

 experiments. As compared with No. 10, 

 this oil is even poorer in "total alcohols," 

 due to a very large decrease in geraniol. 



No. 11. 



Quantity : 95 cc. ; distilled June 28 and 

 September 28, 1907. 



Description: Clear yellow oil with a 

 pleasant odour, A very slight deposit 

 was present. 



Results of Examination. 

 Specific gravity at 15715° C =0-926. 



Optical rotation in 100 mm. tube at 

 20* C = + 1° 31'. 



"Total alcohols" (geraniol and citro- 

 nellal) = 48-7 per cent. 



Geraniol = 25-8 per cent. 



493 



Oils and Fats. 



Citronellal = 22 - 9 per cent. 



Solubility in alcohol : gives a clear solu- 

 tion with its own volume of 80 per cent, 

 alcohol, but becomes opalescent and 

 slightly turbid with 10 volumes of the 

 alcohol. 



Remarks.— This oil was derived from 

 "very broad-leaved mana grass " identi- 

 fied by Dr. Stapf as Cymbopogon Nar- 

 dus, Rendle, var. Linncei Stapf (typicus). 

 The yield on distillation in this case was 

 per 0-17 per cent. The oil has the 

 general character of the normal oils of 

 the group (e.g., Nos. 1, 5, and 9), the 

 percentage of " total alcohols " being, 

 however, rather low. 



No. 11. 



Quantity : 42 cc. ; distilled August 15, 

 1908. 



Description : Clear golden yellow oil, 

 having a good citronella odour, not 

 very pungent. A slight deposit was 

 present. 



Results of Examination. 

 Specific gravity at 15715° C = 0-906 

 ^Ojatical rotation in 100 mm. tube at 



" Total alcohols " (geraniol and citro- 

 nellal) = 64*7 per cent, 



Geraniol =36-5 per cent. 



Citronellal = 28*2 per cent. 



Solubility in alcohol : gives a clear 

 solution with its own volume of 80 per 

 cent, alcohol, and remains clear on dilu- 

 tion with 10 volumes of alcohol. 



Remarks.— This oil is from the same 

 source as No. 11. It shows a large in- 

 crease in the percentage of " total 

 alcohols" present, mostly due to the 

 increase in the amount of geraniol. 



The yield of distillation in this case 

 was 0-10 per cent. 



No. 12. 



Quantity : 134 cc, ; distilled August 6 

 and October 2, 1907. 



Description : Lemon-yellow oil of typi- 

 cal citronella odour. A slight deposit 

 was present. 



Residts of Examination. 

 Specific gravity at 15715° C = 0-917. 



Optical rotation in 100 mm. tube at 



22° C^ - 11° 53'. 



"Total alcohols" (geraniol and citro- 

 nellal) = 59-9 per cent. 



Geraniol = 26*3 per cent. 



Citronellal = 33-6 per cent. 



Solubility in alcohol : gives a clear 

 solution with its own volume of 80 per 

 cent, alcohol, but becomes slightly 

 turbid with 10 volumes. 



