SS ee F 
CONTENTS 
PAGE 
PERINSON, GEO; FE. The genus Endogoné. .. ius) s.0. 0 220. ne: I 
BLAKESLEE, A. F., and B. T. AvErY, Jr. A vegetative reversion 
ROT LOCUS ie che ib, OT ahs od Re SA ae oe 18 
Britton, N. L. The flora of the American Virgin Islands..... 19 
Burns, GEORGE P. Weather conditions and plant development. 119 
Cook, Met T. Modern applications of botany . Sat AEDS 
DoncE, B.O. Studies in he genie Commnesnoren enya Nee 
on the distribution of the mycelium, buffer cells, and the 
Sermimatiom of the aecidiospore... ... 2... 6 sce eee ene ee 128 
East, E. M. Intercrosses between self-sterile plants.......... 141 
Harper, R. A. Binary fission and surface tension in the de: 
Teopmentor. the colony in. Volvox:.:. 42: posse ae 154 
Harris, J. ARTHUR. Further studies on the interrelationship of 
morphological and physiological characters in seedlings of 
JE OS CUS 5 ae EE es re, 8 Ae 167 
HARSHBERGER, JOHN W. American heaths and pine heaths.... 175 
Hotiick, ARTHUR. Some botanical problems that paleobotany 
MaceienmeGit@.SONVE..... su da).4.0 He ntitege co aay eee ere eee ee 187 
Howe, MarsHaty A. Further notes on the structural dimorph- 
ism of sexual and tetrasporic plants in the genus Galaxaura.. 191 
meson ies: The, Uredinales of Oregon... .222 age see ee 198 
JEFFREY, Epwarp C. Evolution by hybridization............ 298 
KuNKEL, L. O. A method of obtaining abundant aaa in 
cultures of Macrosporium solani E. & M. eS oe ~ 306 
MACFARLANE, JOHN MUIRHEAD. Synicheat an in pies structures 313 
Metcatr, HAvEN. The problem of the imported plant disease 
as illustrated by the white pine: blister, rust.. ....2--.2)- “ane 4 227, 
MurriLt, WiLt1AM A. The rosy-spored A garics of North America 334 
OLivE, EpGArR W. The cytological structure of Botryorhiza Hip- 
PO GTONCO Crane cag Rte ah ht a0 a Yb Dt a 5 38 3 an GR a ee eo 337 
OstERHOUT, W. J. V. The nucleus as a center of oxidation acs 342 
REED, GEORGE M. Physiological specialization of parasitic 
FUNG ae See circa OR us 5 :n wivtipgl an tute eee eas 348 
Row.eE, W. W. Relation of marl ponds and peat bogs. . . 410 
SHEAR, C.L. Pathological problems in the distribution of pecate 
able plant. PrOWuUCUSy wes. g- sk< cao. Cae ever ure ave nate 415 
Stewart, F.C. Tubers within tubers of Solanum tuberosum... 423 
ee 
