gio Chemical Analyjts of 



fingers or other molft bodies, into heated glafs flaflcs which 

 can be hermetically clofed. 



The phofphuret of lime, when well prepared, is a com- 

 pa6t mafs of a pale reddifli brown colour inclining to choco- 

 late. It inflames by the leaft humidity, and emits in the 

 air an odour of garlic mixed with that of phofphoratcd hy- 

 drogen gas. 



The fame phofphuret may alfo be prepared dire£tly from 

 lime, by dire6l.ing, by means of a gafometer with a column 

 of water, through a hole formed in the belly of the matrafs, 

 on the red matter, at the moment of adding the phofphorus, 

 a delicate current of carbonic acid gas. 



L. Chemical yinalyjh of an uncommon Species of Zeo- 

 lite. By Robert Kennedy, M.D. F.R.S. F.J.S., 

 and Metnber of the Rojal College of Phyjicians, E,d'm- 

 burgh * . 



JL HE zeolite fubjefted to the following expftriments pof- 

 feffes fome of the dillinguifliing properties common to other 

 ftones of the fame clafs, but differs in certain refpeds from 

 any variety with which I am acquainted. I found it, more 

 than three years ago, in the bafliltic rock on which the cafilfe 

 of Edinburgh is built j and it was inclofed within a mafs of 

 prehnite. 



The colour of this zeolite is in fome parts nearly white, 

 in others grayifh white. It is compofed entirely of ftraight 

 fibres arrai^ged in bundles or maffes of different fizes, all the 

 fibres of each mafs converging towards a common point. 

 The whole fpecimen is an aggregate of thefe mafles, the bafes 

 of which are in contact with the prehnite, and are imprefTed 

 with the form of its furface, which is rounded or botryoidal. 

 The crofs frafture prefents the irregular and ragged ends of 

 the broken fibres, termed the hackly frafture by Mr. Kirwan. 



Although the (liape and arrangement of the fibres appear 

 plainly to be the effeiSls of cryftallization, yet I have not been 

 able to trace a perfeftly regular, determinate form in any of 

 them. However, when the flone is broken, fome of them 

 can be readily feparated longitudinally, in a pretty entire 

 ftate, and feem in moi} inflances to be four-fided and rec- 

 tangular. Their length is from half an inch to two inches; 

 but their thicknefs does not exceed i-4Cth or i-^oth part of 

 an inch. None of thefe fibres can be broken acrofs, fb as to 



* Fio;n ihe Jidinburgh Tranfaftions, vol. v. 



prefent 



