38$ Scientific Intelligence. [Nov. 



By the acids it is dissolved ; the quantity was too small to 

 ascertain whether it formed a jelly. 



Occurs disseminated in grains not exceeding aline in diameter, 

 in nodules composed of feldspath, mica, and sahhte, which are 

 found in the limestone rocks on the sea shore, west of the farm 

 of Balapheitrich, near the quany of primitive limestone in the 

 island of Tyree. The specimen of these nodules which I have 

 brought home with me from that spot being small, and the 

 haiiyne not abundant, and in very small grains, I was very 

 limited in my experiments upon this interesting substance here, 

 for the first time I believe, found elsewhere than in volcanic 

 rocks. I trust that by your exertions, and those of future tra- 

 vellers in the western islands, more will be known of this mineral. 

 To promote such an inquiry, you may, if you think it proper, 

 insert this in some of your scientific journals. I think I have 

 mentioned the place where I found it in a manner clear enough 

 to guide the mineralogist who may chance to visit the island of 

 Tyree. It is on the rocks near the high water mark, exactly 

 due west of the farm house of Balapheitrich, in round nodules 

 projecting from the surface of the limestone strata. 



Believe me, my dear Sir, your obedient humble servant, 



L. A* Necker, Prof. 



IV. Tungstate of Lime. 



This rare mineral, the nature of which was first ascertained 

 by Scheele, was some years ago subjected to a rigid analysis 

 by Berzelius. He found it a compound of 



Tungstic acid 80-417 100-00 



Lime 19-400 24-12 



As it is a neutral salt, there can be no doubt that it is a com- 

 pound of one atom tungstic acid and one atom lime. Hence if 

 an atom of lime weigh 3*625, an atom of tungstic acid must 

 weigh 15. 



Professor Bucholz and Mr. Rudolph Brandes, without being- 

 aware of what had been done by Berzelius, have lately subjected 

 two varieties of this mineral to a very careful analysis. It is an 

 object of some consequence to compare the results which they 

 obtained with those of Berzelius, that we may see how far they 

 confirm his conclusions. I shall, therefore, state here the 

 composition of the two minerals according to their analyses. 



The first variety had a yellowish white colour, and a specific 

 gravity of 6-076. It was from Schlackenwald. Its constituents 

 were 



Tungstic acid 78 



Lime I93V 



Silica 2 



99^ 



