388 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS varieties of lavender are "Maillette" and "Matheronne". Those of lavendin are "Abrialis", "Super" and "]•pi Carrd". All these plants differ consider- ably in appearance from the parent types and from each other, and their oils have characteristic odours. It is interesting to compare chromatograms of their oils with those of standard oils of lavender and lavendin, and especially to compare the structures of the group of the four peaks A, B, C and D. Fig. 11 compares two oils of ordinary lavender, differing mainly in ester content. This is shown by their chromatograms, which closely resemble each other in other respects, including Groups A--I). Fig. 12 shows how much greater are the differences between oils of ordinary lavender and • •: •-• '5'* ...... • •--T •"• , , • , '"?• .... Figure 1• Chromatogram of an oil of lavender "Matheronne". "Matheronne", these being particularly striking in Group A--D. Fig. 18 illustrates similarities between two oils of lavender "Maillette", both of whose chromatograms also differ markedly from the previous ones. The relative size of Group A--D and the proportions of its four peaks are again quite distinct. Fig. 14 compares oils of lavendin "Normal", "l•pi Carrd", "Abrialis" and "Super". These four oils, too, produce very dearly defined chromatographic patterns, notably in respect of the structure and size of Group A•D. Fig. 1• shows the close similarities of pattern between two other oils of "abrialis". Not only are oils of lavendin differentiated from oils of lavender by their greater content of cineole (peak A) and camphor (peak X), but in these chromatograms we may actually identify the individual oils by writing

GAS-LI•)UID CHROMATOGRAPHY AND THE PERFUMER 389 :. (b) Figure 18 Comparative chromatograms of two oils of lavender "Maillette". down against each of them the letters A--D in order of relative sizes of the corresponding peaks :- LAVENDER: Ordinary C D B A "Maillette" B C D A "Matheronne" D C A B LAVENDIN: Normal A C D B (Group large) Abrialis D -----A C B ]•piCarrd C A D • B Super A C D B (Group small)