CONTENTS 



Original Papers 



Physics. — Note on graphic solutions of Wien's spectral equation. George K. 



Burgess 105 



Mineralogy. — The chemical composition of nephelite. Waldemar T. Schal- 



ler 109 



The alunite-beudantite group. Waldemar T. Schaller 112 



The rel itions of purpurite and hetcrosite. Waldemar T. Schaller 113 



Note on barbierite, monoclinic soda feldspar. Waldemar T. Schaller.. . ". 114 



Petrology. — Note on some albitite dikes in Nevada. Frederick Leslie Pan- 

 some 114 



Botany. — The genus Annona: the derivation of its name and its taxonomic 



subdivisions. W. E. Safford 118 



Abstracts 



Electricity 121 



Agricultural physics: .' 121 



Analytic chemistry 122 



Agricultural chemistry .• 123 



Biological chemistry 128 



Geology 129 



Botany 132 



Forestry 133 



Agriculture •' 134 



Conchology 135 



Engineering '. 136 



References 138 



Peocefdings 

 Geological Society of Washington 139 



