284 MR G. CARR ROBINSON ON THE 
These agree well with carbon percentage demanded by formula (C,;H,;0,), Ba. 
Theory, 55°41 ; found 55°40 and 55°39. 
These results show conclusively that when the combustion of baryta salts of 
the higher fatty acids is made with chromate of lead, that not only is the 
“ carbon found” always less than that demanded by theory, but also that the 
deficiency in carbon is exactly accounted for by a// the barium being left as 
carbonate, hence it is absolutely necessary to employ, along with chromate of 
lead, some other substance that readily gives up oxygen, such as bichromate of 
potash. 
A mixture of fused borax and oxide of copper has been recommended in 
the analyses of salts such as these. Experiments made with this mixture were 
very unsatisfactory, the ‘‘carbon found” being the same as when oxide of 
copper alone is used. 
The analysis of these baryta salts, prepared from the ethers, shows the 
presence of the same fatty acids as those found by other observers and by other 
methods. 
OvuDEMANS denies the presence of the acid C,,;H,,O,, cocinic acid, in coco 
butter, and doubts the existence of such an acid ; whilst Bromets and St Evreé 
both found an acid, melting point 35° C., and having the formula C,;H,,O,. 
FEHLING found in coco-nut oil an acid resembling, in appearance and melting — 
point, that prepared by Bromets. 
Heintz considers this acid a mixture on account of its low melting point, 
which is lower than that of lauric acid, C,,.H.,O,, whereas it should be inter- 
mediate between that of lauric acid, melting point 44° C., and myristic acid, 
melting point 54° C.; he finds, moreover, that a mixture of these two acids in — 
the proportion of fourteen parts of lauric to two parts of myristic does melt at 
about 35° C. . 
On the other hand, the existence of this acid, C,,H,,O, , in coco butter is con- 
firmed by the analysis of the baryta salt marked P; the formula (C,;H,;O,), Ba, 
as already shown, requiring 
Carbon, . : : : 3 : : 55°41 
Hydrogen, : ; : : : : 8°88 
Barium, . é : : , : : 24:33 
whilst these analyses, made with a mixture of chromate of lead and bichromate 
of potash, show— 
Ip IT. 
Carbon, : ; 3 ; 55°40 55°39 
also the acid, from which this baryta salt was prepared, had a melting point of 
45° C., and solidifies at very nearly the same temperature. 
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