Frodeeclings of the Boyal Scottish Society of Arts. 377 



most admissible formula. These chemists found in the case 

 alluded to — 



100.61 



Considering, however, that the other analyses of Philipsite, 

 by Kbhler and Gmelin and Hepel, can hardly be brought within 

 this formula, 1 should by no means be inclined to give it as 

 one which may be adopted with perfect certainty. 



The presence of soda which has not been previously ob- 

 served in this mineral, was clearly ascertained, as it also was 

 in the previous instance of the barytic harmotome of Stron- 

 tian, although in much less quantity. Indeed, I have reason 

 to believe, that the presence of a portion of this alkali in mi- 

 nerals, usually regarded as containing potash only, is much 

 more frequent than is commonly supposed. 



If we assume what it would seem can now hardly be doubt- 

 ed, that there is an essential atomic difference in the chemical 

 constitution of the two species, we shall of course be prepared 

 to expect that the measurements of the angles will also pre- 

 sent differences, although the general form of the crystals 

 may be similar in the two cases ; and the ordinary opinion of 

 crystallographers appears to be in favour of the existence of 

 such differences. 



Proceedings of the Boy at Scottish Society of Arts, 



(Continued from Vol. xxxiii., p. 414.) 



14/A March 1842. — Sir John Robison, K.H., President, in 

 the Chair. The following Communications were made : — 



1. Part Third of Mr George Glover's communications on Drowning, and 

 observations on the best means of Resuscitation, being the principles of 

 Pneumatics applied with a view to improve the apparatus employed by Hu- 

 mane Societies for producing Artificial Respiration, and an investigation 

 of the Pneumatic Laws involved in the operation. Thanks voted. (850.) 



