EJIylSHA MITCHELL SCIENTIE^IC SOCIEJTY. 13 



DOUBLE EIRCONATES. 



Two attempts at the formation of double zirconates 

 were made. 



/. Potassmrn calciimi zirconate. 



About two g-rams each of zirconia, potassium hydrox- 

 ide and lime were heated tog-ether for about four hours. 

 There was evidence of considerable action. The mass 

 was treated with dilute acetic acid and thorou£fhly wash- 

 ed. Then on treatment with dilute hydrochloric acid 

 nearly the whole residue went into solution. The analy- 

 sis g-ave ZrO„ 67.21 per cent.; CaO, 31.06; K,0, 1.11. 

 This is a calcium zirconate, (CaO.^irOa), with a small 

 part of the CaO substituted by KgO. 



2. Potassiiun aluminiun zirconate. 



Two g-rams of zirconia were fused for eig-ht hours 

 with two g-rams potassium hydroxide and three g*rams of 

 alumina. The mass was washed with dilute acetic acid 

 until no more alumina was dissolved. The residue was 

 treated with dilute hydrochloric acid and the insoluble 

 portion removed by filtration. The analysis g-ave ZrO^ 

 72.38 per cent; AlA, 7.66; K^O, 20.00. These experi- 

 ments indicate the possible existence of double zirconates, 

 and when time permits this point will be further examin- 

 ed. 



RIVER ADJUSTMENTS IN NORTH CAROLINA. 



W. J. WEAVER. 



NoTK. — In presenting this paper I beg to acknowledge my 

 indebtedness to the lectures of Prof. Collier Cobb, and to his 

 work and that of Messrs. Chas. Baskerville, R. H. Mitchell 

 and other members of the class engaged in advanced work in 

 Physical geography; but the mode of presentation is my own 

 and I alone am responsible for any short-comings it may have. 

 As my paper was presented for the Kerr Prize in Geol- 



