NOVEMBEE 10, 1911] 



SCIENCE 



647 



polymerization is forced on one by the inspec- 

 tion of a useful table of Woodiwis (Chem. 

 News, Vol. 9Y, p. 122, 1908) who takes the 

 combining weights as abscissas and the mono- 

 The greatest irregularity in the whole list valent specific gravities (S.G./V.), to use his 



circle circle circle circle circle circle 

 Calculated .48 .73 1.1 1.5 1.94 2.84 

 Kequired .5 .67 1 1.5 2 3 



O/ten native Easily reduci [Dte./Dif/"iculHy reducible . Not n3 tive 



Or^anometall/c derivatives \No organometallic derj/ahi/es, 

 (Including K,C a and the ocUnls on the n^tit ofAA). \ indouble octants exce/t K and Ca, 



Single and double 0)C.ides common ij/^nature. 

 Single and double sulphides common in nature 



^ A 



Fig. 3. Meridional Relations. Part of these relations are strictly meridional; part divide 

 on the line AA which passes to the right of C and Si; part divide on the line BB, which passes 

 between C and Si. 



of the elements is in Na = .9, Mg = .88, convenient term, as ordinates. This table 

 Al = .85 instead of .67. The fact of this shows that while the other elements are ar- 



