TABLE OF CONTENTS 



Second note on certain peculiar fungus-parasites of 



living insects (with plates I-V) - Roland Thaxter 



Upland societies of Petoskey-Walloon Lake region. 

 Contributions from the Hull Botanical Labora- 

 tory 256 (with one figure) H. D. Clayberg 



Field and laboratory studies of Verbena. Contribu- 

 tions from the Hull Botanical Laboratory 257 

 (with plates VI-IX and twenty-six figures) - M. Kanda 



A chemical analysis of Sudan grass seed. Contribu- 

 tions from the Hull Botanical Laboratory 258 

 (with one figure) - F. M. Schertz 



Formative effect of high and low temperatures 

 upon growth of barley: a chemical correlation. 

 Contributions from the Hull Botanical Labora- 

 tory 259 (with eighteen figures) - - - H. L. Walster 



Physiological study of maple seeds. Contributions 

 from the Hull Botanical Laboratory 260 (with 

 two figures) H. A. Jones 



Polyembryony among Abietineae. Contributions 

 from the Hull Botanical Laboratory 261 (with 

 fifteen figures) ------- John T. Buchkolz 



Chemical and physical changes during geotropic 

 response. Contributions from the Hull Botani- 

 cal Laboratory 262 - - - - - - Thomas G. Phillips 



Position of scutellum and homology of coleoptile in 



maize (with eleven figures) - Paul Weatherwax 



Short cycle Uromyces of North America (with 



plate X) - - - - - - - - G. R. Bisby 



Effect of salts upon oxidase activity of apple bark. 

 Contributions from the Hull Botanical Labora- 

 tory 263 (with five figures) - - - D. H. Rose, 



Henry R. Kraybill, and R. C. Rose 



Pit-closing membrane in Ophioglossaceae (with 



plates XI, XII and six figures) - Gertrude Wright 



Dothidiaceous and other Porto Rican Fungi (with 



plates XIII, XIV and three figures) - - - F. L. Stevens 



Spermatogenesis in Blasia (with plate XV) - - Lester W. Sharp 



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