1911] 



on a New Method of Oiemical Analysis. 



143 



with one chai'o^e ; H2+ that it is a molecule of hydrogen with one 

 charge : N^^. that it is an atom of nitrogen with two charges ; and 

 so on. 



With nitrogen from NH4NO2 the lines were as follows (the 

 magnetic force was so large that some of the lines corresponding to 

 the lighter particles were thrown off the plate) : — 



6-1 c;+ 



7-02 N++ 

 12-08 C+ 

 14-01 X+ 

 27-9 N.,+ 



44-2 C0.+ 

 65-5 Hg++ 

 100 Hg+ + 

 204 Hg+ 



-(?) 



The next slide is the positive-ray spectrum for CO, and again the 

 magnetic field is so great that the lighter carriers do not appear. 



From the measurement of the lines we find that the atomic weight 

 of the carrier is — 



Positive. 



Negative. 

 12 C_ 

 16 0+ 



The spectrum 

 weights are : — 



for CO2 is represented in Fig. 6 ; the. atomic 



43-9 CO0+ 



62-5 Hg+++ (?) very faint 



99-6 Hg+ + 



200-0 Hs:^ 



The spectrum of CH4, of which a small region with five lines 

 close together is shown in Fig. 4, is interesting, because the measure- 

 ment of these lines shows that their atomic weights are 12, 13. 14, 

 and 15, 16, and thus that we have here C, CH. CH2, CH3, CH^. 

 If I am not mistaken, this is the first occasion when the atoms 

 CH, CH2, CH3. have been observed in a free state. 



The spectrum of the analogous compound chloroform CHCI3 



