324 F. B. GUTHRIE. 



Case 3 is represented as follows : — 







„S <r- S +a 



In this case, one of the upper and lower atoms have each 

 lost two corpuscles becoming in consequence charged with 

 two unit charges of positive electricity, one of the right and 

 left hand atoms have acquired two unit charges of negative 

 electricity, and the intermediate atoms have gained and 

 lost a negative corpuscle and are consequently neutral. 



Case 4 is represented as follows : — 



I i 



s->s 



-2 



Here again we have a molecule of symmetrical structure 

 in which the positively charged atom in one part of the 

 molecule is balanced by the equally negatively charged 

 atom in the other, but its configuration suggests that it is 

 probably more readily altered than the previously figured 

 molecules in which the electrical charge is more evenly 

 divided. It may represent one of the less stable modifica- 

 tions, probably the plastic variety. 



We have here figures that may not unreasonably be 

 regarded as representing the four comparatively stable 

 modifications of the element sulphur. The viscid modifica- 



