I 



674 



BEPORT — 1884. 



\ 



I f 



pared, that useful results would probably be obtained. Experiments Iinve provM 

 this to be tho case, and in the series of liom()l(i},'ous oompouuds it was found tliat 

 for every addition of (UI., a definite increase' of what is called the ' UKilpcular 

 rotation ' is obtained ; besides this it was i'ound that the rotation also was capsibli' 

 of indicatini): diil'erences in tho constitution of organic compounds. Isosecondarv 

 and tertiary bodies give dill'erent results from norujal compounds. The coinpnuiids 

 containing tiio halogens were also referred to, and fornmhe given, l)y wliicli 

 molecular rotation of twenty-six series of compounds could be calculated. ' 



4. 0)1 the in'cscnt state of oar Knotrh'ilfjr of Ticfniction Eiiuivalfiittt, 

 Jill Dr." J. H. G LADsrox k, F. L: S. 



The law tluit the refraction equivalent of a com])ound is the sum of tln^ 

 refraction equivalents of its constituents, although of general, is not of uiiiversnl 

 application. The departures from it indicatt; some important change in the ininli- 

 of combiiuition of tlu' elements, and tluis the specific refraction or disper.-ion of 

 light by a compound body proves a valuable means of investigating its eheniiciil 

 structure. The papers of Ihiibl three years ago gave a new impulse to the study 

 of this subject, and during the ])ast twelve months several important cotnmiiiii- 

 cations have been maile, es]iecially by Kanonnikov of the Kasan University, by 

 Nasini of Itome, and by lileekrode of the Hague, wliile the author of this jKipi'r 

 has published observations that have been accumulating for some years. 



Hmfkaction-Equivalkn'ts oi.' tuk Klk.mknts. 





IClcnicnt 



77 

 245 

 1.V4 

 1.V8 



oi 

 38-2 



ulxnit '» 



1 r,-.T 

 i:$i 

 in-i 

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 .-.0 



Gl 



lit-O? 



9''.» 



1.V4 



iiii()iit22 

 lO'l 

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2;'.:; 

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1:! 

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ll-C 



i:)-4 



22!l 



. ('■■ 



Jlanganese 



nates . 

 JIere\u'y 

 Nickel . 

 Nitrogen 



11 



&c. 



ni permanga- 



iu bases, oxides, 



Oxygen, single bonds . 



„ double bonds . 



Palliuliiun 



I'liospliorus .... 



I'latimun 



Potassium 



Rhodium ..... 



Ilubidium 



Selenium ..... 

 Silieium 



„ in Silicic Acid 



Silver 



Sddimu 



Strciutium 



Sulphur 



,, singh.' bonds . 



Thallium 



Tin, bivnleut .... 

 ., i|ii;ulri\alent . . 



Titnuiinu 



KrrniiuMi 



\'aiiadiiHii . , '•;, , , 



Zinc 



Zivcniiiiim 



-*L ^ 



55 



200 

 58-7 i 

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k; I 



10(5 1 



:ii I 

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:?'.)• 1 1 

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85-4 ! 

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I -5 



108 

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87'i 



20:]-0 



118 I 



48 



2;!7(; 

 r.i;; 



■)0 



11-7 



iiiioiit -5 

 194.' 

 100 

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5-1 



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1 74 



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2i;i 



