176 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



rejection of fairly large fractions, chiefly lanthanum and cerium, at the 

 less soluble end of each series, and the rejection of much smaller frac- 

 tions, partly neodymium, at the more soluble end, until 174 series of 

 crystallizations had been made. From the diagrams it can be seen that 

 the number of fractions rapidly increased from the outset to a fairly 



se/ves 



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1807 8. 9, 10 II 



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 Si Si 6* Si Sfe 87 tl^ £9 ye >/ 9^ $3 94 ?S $6. 97 ?99B 



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'6 "57 3*8 ^V 60 61 62 63 

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 4/7S 8l> pi B2 83 04 05 til, 07 HA 99 W ft\ fi 93 94 9$ fb 9\ 98 99 o' 4207 

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 y4225 26 27 2a 29 3o 31 31 33 39 3i '3b 37 3b 3'j 4$ 4/ 42 43 44 45 46 4247 

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SERIES 

 17+ 



180 



190 



ZOO 



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 436/ ^2 "6J 64 6^ '*6 67 ^) 69 70 Q7J >2 73 [g9 W 76 gg >0 ^ Sf Efl 02 1438 31 



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constant number between 20 and 25. In series 174 a spectroscopic 

 examination of the more soluble fractions showed that fraction 3478 

 contained a very small quantity of neodymium, the absorption band at 



