. Bulletin of the British Ornithologists' Club. . J00 % diméthyl 100 % Triméthylcyclohex subsf trimefhyl-2,6,10-. La figure 2. La variation intraspécifique de la composition quantitative de la cire gras à partir de la sécrétion de la glande uropygienne Blackbird Turdus merula (n  = 18). Comme nous le savons maintenant, toutefois, il n'est absolument pas le cas. Avant la chimio- considérations taxonomiques, la variation intraspécifique de la compo- tion des lipides doit être vérifiée. Cela a été fait pour un certain nombre d'espèces et de la variation est très limitée, comme le montre la Fig. 2, avec Turdus merula comme comme par exemple. Le cercle surro

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. Bulletin of the British Ornithologists' Club. . J00% Dimethyl 100% Trimethyl 2, 6, 10-trimefhyl-subsf. Figure 2. Intraspecific variation of the quantitative composition of wax acids from the uropygial gland secretion of the Blackbird Turdus merula (n = 18). As we know now, however, this is definitely not the case. Prior to chemo- taxonomic considerations, the intraspecific variation of the lipid compo- sition has to be checked. This has been done for a number of species and the variation is found to be very limited, as may be seen from Fig. 2, with Turdus merula as as example. The circle surrounding the cloud of single points in this figure may be taken as a measure of the degree of intra- specific variation and it is the size of this cloud which decides whether 2 species can be separated by this method. Individuals of a species and its subspecies or races cannot be distinguished from each other by this method. Within different genera, only quantitative differences are found, which in many cases, however, are not significant and hence often cannot be used for classification. Qualitative structural differences may be expected at the family level, where at least quantitatively different pat- terns are observed. Orders may be distinguished by their qualitatively different patterns. In Table 1 the specific characters for a number of orders are summarized. These data not only allow distinction between orders, but also seem to indicate relationships between some of them. For instance, it appears reasonable to assume that kiwis (Struthioniformes), tinamous (Tinamiformes) and galliform birds (Galliformes) form a group of related orders on the basis of the occurrence of alkane-2, 3-diols in all of them. Similarly, Phoenicopteriformes and Anseriformes have many typical. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the origi

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