NOVEMBEE 10, 1911] 



SCIENCE 



651 



3. Evolution and Devolution As the vix-generatrix passed over each unit 



The helix is a working model and it eug- space in the first circle the conditions favored 



gests that there is only one enduring stable the formation of a new element. In this cir- 



]H5PbT™-SnG 





Fig. 6. Allied relations of partial or complex symmetry which do not come into the pre- 

 ceding categories. They are described in the section with which they are most nearly related. 



assemblage of corpuscles between das Urstoff 

 and hydrogen with its thousand corpuscles, 

 and if that element be coronium, it has en- 

 dured only under the exceptional conditions 

 of the corona. 



cle are the simplest forms of matter from 

 hydrogen to helium. They appear abundantly 

 in the nebulse; existing and perhaps formed, 

 near the absolute zero, where no heat vibra- 

 tions could yet be predicated and where unex- 



