Nature of the so-called Elements. 101 
‘How far this and similar variations between photographic 
records and the solar spectrum are due to causes incident to 
the photographic record itself, or to variations in the intensi- 
ties of the various molecular vibrations under solar and terres- 
tial conditions, are questions which up to the present time I 
have been unable to discuss.” 
An Objection Discussed. 
reply would be that it proves too much. If it demonstrates 
known compounds of calcium to calcium itself. There is a 
perfect continuity of phenomena from one end of the scale of 
temperature to the other. 
Inquiry into the Probuble Arrangement of the Basic Molecules. 
As the results obtained from the above considerations seemed 
to be so far satisfactory, inasmuch as they at once furnished 
an explanation of the basic lines actually observed, the inquiry 
was thought worthy of being carried to a further stage. 
