CONTENTS 



San Francisco as a Mecca for Nineteenth Centurv Naturalists 



Joseph Ewan 1 



A Century of Astroxo.^iy and (Jioodesy in California . . .Ericin (i. Giulde 65 



The Contribution of Natural History to Human Progress . .G.F. Ferris 75 



Classification and Taxonoimy of the Bacteria and BluegreexV Algae 



C. B. Van Niel 89 



Classification of the Algae George F. Papenfuss 115 



Mycology Ernst Athearn Bessey 225 



Bryology WiUimn C. Steere 267 



Pteridology Irc7ie Manton 301 



The Systematics of the Gymnosperms Rudolf Florin 323 



The Systematics of the Angiosperais Lincoln Constance 405 



Systematic Entomology Edward S. Ross and Collaborators 485 



Introduction Edward S. Ross 485 



The "Apterygota" Charles L. Remington 495 



Odonata Leonora K. (}lo\jd 506 



Ephemeroptera George F. Edmunds, Jr. 509 



Plecoptera Per Brinck 512 



Embioptera Edward S. Ross 515 



Zoraptera Ashley B. Gurney 516 



SoAiE Minute Insects: Anoi'luka, Mvllophaga, and the Scale 



Insects G. F. Ferris 517 



Psocoptera ( Corrodentia, Copeognatha) 



K. M. Sommerman and J. V. Pearman 523 



Thysanoptera Stanley F. Bailey 525 



IIOMOPTERA AUCHENORHYNCHA Z. P. Metcolf 527 



IIemiptera Robert L. Usinger 534 



Neuroptera and Mecoptera F. M. Carpenter 536 



ix 



