554 



Scientific Intelligence. 





A. 



B. 



c. 



D. 



Average. 



NiO 



0-0320 



0-0630 



0-0170 



0-0066 



0-0296 



As 2 & ... 



o-ooio 



trace 



0-0004 



0-0007 



0-0005 



PbO .... 



0-0073 



0004 



0-0002 



0-0008 



0-0022 



CuO .... 



0-0200 



0-0160 



0-0043 



0-0117 



0-0130 



ZnO_.... 



0-0052 



o-oovo 



o-ooio 



0-0064 



0-0049 



The following percentages of other minor constituents were 

 found in the composite samples of the earthy materials, while the 

 last column shows the mean of many determinations in rocks : 



A. 



BaO 0-17 



SrO 0-046 



Cr a O s 0-01 



V 2 3 0-028 



Zr0 2 undet. 



LiO .... 



The authors say that the data so far obtained may not be final, 

 but they clearly indicate the several orders of magnitude which 

 it was sought to determine. — Chem. JVeios, cix, 159. h. l. w. 



B. 



C. 



Rocks. 



0-05 



0-08 



0-086 



0-025 



trace 



0-031 



0-044 



0-01 



0-031 



0-028 



0-02 



0-014 



undet. 



0-05 



0-015 









0-008 



2. The Spitting of Silver. — H. B. Baker, considering the fact 

 that the amount of oxygen absorbed by melted silver is so large 

 that it seems difficult to explain it as a case of simple solution, 

 has made an attempt to detect the presence of an oxide of silver 

 in the molten metal, and has found that when very pure molten 

 silver is partly covered with molten boron trioxide in an atmos- 

 phere of oxygen, a large amount of borate of silver is formed and 

 dissolved by the boron trioxide, while if the surface of the silver 

 is completely covered by the trioxide no silver borate is produced. 

 These experiments appear to indicate the existence of silver oxide 

 in the molten metal, although it cannot be claimed that an 

 absolute proof has been obtained, because there is a possibility of 

 the reaction of three substances together, no two of which will 

 otherwise unite. — Chem. JVetvs, cix, 127. h. l. w. 



3. A Laboratory Guide to the Study of Qualitative Analysis, 

 by E. H. S. Bailey and H. P. Cady. 8vo, pp. 280. Phila- 

 delphia, 1914 (P. Blakiston's Son & Co. Price, $1.25 net).— 

 The appearance of this seventh edition of this work indicates 

 that it is extensively used. It has been changed but slightly 

 from the previous issue. The book contains less printed matter 

 than is indicated by its pages, as nearly half of them are left 

 blank for notes. The book evidently gives a good course of 

 analysis, but it has received adverse criticism on account of 

 extensive use of the ionic nomenclature. This criticism appears 

 to be warranted, in spite of the general acceptance and the 

 undoubted importance of the ionic hypothesis in explaining why 

 acids, bases, and salts readily exchange their radicals in solution. 



