VOL. LXXX.] PHILOSOPHICAL TRANSACTIONS. 66/ 



noticed by Mr. Stark between the 2 heads, more particularly those of the supe- 

 rior with the lower, or more perfect, Mr. H. believes that there was a more in- 

 timate connection between them than simply by means of nerves, and therefore 

 that the substance of the brains was continued into each other. Had the child 

 lived to a more advanced age, and given men of observation opportunities of at- 

 tending to the effects of this double brain, its influence on the intellectual princi- 

 ple must have afforded a curious and useful source of inquiry; but unfortunately 

 the child only lived long enough to complete the ossification of the skull so as to 

 retain its shape, by which means we have been enabled to ascertain and register 

 the fact, without having enjoyed the satisfaction that would have resulted from 

 an examination of the brain itself, and a more mature investigation of the effects 

 it would have produced. 



In pi. 8, fig. 2, the child is represented as it appeared at the age of 20 months, and is copied 

 from a picture in the possession of Mr. Stark. The painting was taken from the child 6" months be- 

 fore its death by Mr. Smith, an ingenious artist, at that time residing in Bengal. It conveys a gene- 

 ral idea of the appearance of this extraordinary child, and the relative proportions between the double 

 head and the body. In fig. 3, the double head is represented of a larger size. One of the eyes of 

 the upper face appears smaller or more contracted than the other 5 this is in consequence of the injvuy 

 it received when the child was thrown upon the fire. The superficial veins on the forehead of the 

 upper head are very distinctly seen. Fig, 4 is an exact representation of the double skull, which 

 is in Mr. Hunter's collection, upon the same scale. It shows the curious manner in which the 2 

 skuUs are vmited together, and the number of teeth formed before the child's death ; which circum- 

 stance ascertains, with tolerable accuracy, its age. 



XF'IL On the Analysis of a Mineral Substance from New South Wales.* By 

 Josiah Wedgwood, Esq., F.R.S., and A.S. p. 306. 



This mineral is a mixture of fine white sand, a soft white earth, some colour- 

 less micaceous particles, and a few black ones resembling black mica or black- 

 lead ; partly loose or detached from each other, and partly cohering together in 

 little friablie lumps. None of these substances seem to be at all acted on by the 

 nitrous acid, concentrated or diluted; nor by oil of vitriol diluted with about equal 

 its measure of water ; in the cold, or in a boiling heat ; the mineral remained 

 unaltered in its appearance, and the acids had extracted nothing from it that 

 could be precipitated by alkali. 



Oil of vitriol boiled on the mimeral to dryness, as in the process of making 

 alum from clay, produced no apparent change in it ; but a lixivium made from 

 this dry mass with water, on being saturated with alkali, became somewhat tur- 

 bid, and deposited, exceeding slowly, a white earth in a gelatinous state, too 



• From Sydney Cove, New South Wales. Along with the mineral here analyzed, Mr. W. was 

 presented by Sir Joseph Banks with some clay firom Sydney Cove, which Mr. W. found to be an ex- 

 cellent material for pottery, adding that it might certainly be made the basis of a valuable manufac- 

 ture for our infant colony there. 



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