ANALYSIS OF CORUNDUM, SfC. 7 



§ 5. Another bagatelle of this kind, relating to pneumatic Another old in- 

 inirruments, is a pretended new method of doling bottles and ventlon * 

 other veflels air-tight without luting or grinding, which, a few 

 years paft, I faw recommended (I do not recollect in which of 

 our Journals), and which confifts in having a groove round the 

 neck into which a cap fits, fee Fig. 3 ; fo that this groove (a) 

 may be charged with water or mercury as circumftances re- 

 quire. This likewife belongs originally to Glauber, as may 

 be feen in the plate juft before quoted of the translation of his 

 works. 



There is nothing new under the fun, fays Solomon, Eccles. I. 

 v. 10. and more of this kind of old news fliall be occalionally 

 given by, 



SIR, 



Your humble fervanf, 



N.N. 

 December 12, 1802. 



III. 



Analyfis of Corundum, and offome of the Subjiances which accom~ 

 pany it ; with Obfervations on the Affinities which the Earths 

 have been fuppofed to have for each other in the humid Way, 

 By Richard Chenevix, Efq. F. R. S. and M. R. L A. 

 From the Fhilofophical Tranfaclions for 1 802. 



S 



§i. 



OME kinds of corundum, fuch as the adamantine fpar of Kinds of coruji* 

 China, and the fapphire, have already been analyzed by Mr. dumnot exa- 

 Klaproth. This would have rendered any further experiments ™ otn . y 

 unneceffary, were it not, that I have had at my difpofal many 

 kinds of corundum he did not poffefs, and alfo fome fubftances 

 accompanying it, which were unknown before the preceding 

 communication of the Count de Bournon. 



As, from the refult of my analyfes, it appears that all the All the kinds 



different kinds of corundum are nearly fimilar in their confti- are ^\ milir }Y 

 , ,.~ .... . . ... conftituted. 



tuent parts, and differ only in their proportions, it would be 



tedious to mention every experiment I made upon each kind 1 . 



I fliall therefore confine myfelf to ftating, once for all, fuch 



modes 



