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can be fused by the blowpipe ; and if of the transparent 

 kind; it at first becomes opaque: if the heat be continued 

 it becomes transparent, and at length fuses. The opaque 

 first become transparent, and then fuse. Mr. Kirwan says 

 the Vesuvian garnets fuse per se : but our Vesuvian garnets 

 appear to agree with what Haiiy says of his amphigene, 

 (viz.) that it is infusible, although the analcime may be 

 fused: both sorts are said to be found at Vesuvius. The 

 hyalite, zeolite, and analcime of these 3 plates seem nearly 

 allied*, and by some are thought to be varieties of each 

 other. We hope, however, analysis will soon clear up the 

 point. Haiiy takes his name from the weak degree of elec- 

 tricity this mineral receives by being rubbed ; and we have 

 found it just capable of holding a hair for a short time. 



* As they are all fusible per se by the blowpipe, and agree somewhat in 

 this particular with the Scotch phosphorescent zeolite, of which the analysis 

 is given by Mr. Kennedy in the Phil. Magazine ; it is desirable for that gen- 

 tleman to examine the difference, and favour the world with the result. 



