374 Scientific Intelligence. 



As these numbers agreed ill with the theory of definite proportions, he 

 repeated the analysis with care^ and obtained the following results : — 



Oxygen. 

 Silex, - - 23.76 containing 11.95 6 



Alumina, - - 39.68 18.58 9 



Water, - - 35.74 . 31.78 \Q} 



Sulphuric acid, - .65 0.38 



Lime, - - traces. 



It consists, therefore, of two atoms of bi-hydrate of alumina, one atom 

 of bi-silicate of alumina, and four atoms of water, neglecting the sulphuric 

 acid. It ranks next Halloi/sife. — Ann. de Chim. 



10. Mineral Pitch near St Agnes, Cornwall, discovered by Mr Hen- 

 wood. — This substance has been discovered by Mr Henwood in the cop- 

 per veins of south Huel To wan Mine, near St Agnes, Cornwall. It ac- 

 companies iron and copper pyrites, and coating crystalline quartz. It oc- 

 curs abundantly in the small cavities which exist in the veins. Except- 

 ing in the Carharrack Mine, we believe it has never before been observed 

 in that county. 



11. Fresh discovery of the Chr ornate of Iron in Shetland. — The abundance 

 in which this ore is found as a constituent of the serpentine rock, is now 

 adding considerably to the wealth of this remote province of Scotland. The 

 landed proprietors continue in an active search after it, as the following 

 extract of a letter, dated the 27th of January 1830, sufficiently shows. It 

 is addressed to Dr Hibbert from Thomas Giffijrd, Esq. of Busta, a prin- 

 cipal landed proprietor in these islands : '' I take the liberty,'' he writes, 

 *' of addressing a few lines to you on the subject of the chromate of iron. 

 As you predicted, it has been found in quantity on the Ness of Hills- 

 wick and elsewhere in Northmavine." 



12. Observations on Serpejits. By M. Desvoidy. — On the 19th Octo- 

 ber 1829, M. Robineau Desvoidy communicated to the Institute the two 

 following observations. 1. In a clayey and sandy soil he found a great 

 quantity of the Anguis fragilis of Linnaeus, the common Blind Worm, and 

 in opening one of the largest, he found six young ones alive, and more or 

 less developed. 2. Having dissected a viper, one of these commonly cal- 

 led in France the Red Serpent, he found in the uterus more than 3000 

 young onec in different states. 



13. Acceunt of another case of United Twins in the East. — The union 

 of twins by a corporeal band, as in the example of the two Siamese youths 

 now exhibiting in the metropolis, is a phenomenon not unparalleled, espe- 

 cially in the East, where lusus naturae are, perhaps, more frequent than in 

 other parts of the world. 



