Proceedings of the Ohio Academy of Science 25 
SCIENTIFIC SESSIONS. 
The complete scientific program of the meeting follows: 
Presidential Address. 
What Has the Future for Geologists?.......... G. D. HUBBARD 
Addresses in Joint Session with Ohio College Association 
and A ffiliated Societies. 
(See Page 13). 
Papers. 
Parthenogenesis in the Dandelion. 20 min. (Lantern)...... Paut B. SEARS 
Exploration of Tremper Mound. 30min. (Lantern)............ W. C. Mitts 
The Educational Value of Wood Study. 10min. (Lantern)..A. B. PLOWMAN 
Botanizing in Porto’ Rico. 30min. (Lantern)................ Bruce FINK 
Parallelism between the Cystid Agelacrinites (fossil) and the Holothurian 
Psolus (recent), with Demonstrations. 15 min....... STEPHEN R. WILLIAMS 
The Axial Rotation of Microorganisms and its Evolutionary Significance. 
1Q) THIN. 5 4 ood Soe OA bE Gbldn,e doa GSC Coca ier rae nena ae neee L. B. WALTON 
A New Method for Marking Slides. 3min................... PauL B. SEARS 
MarcommOmonbinettidcs (GO TMM. y las. cca de egses enews. Cart J. DRAKE 
Insect Population of Grasslands. 12 min. (Lantern)...... HERBERT OSBORN 
Genitalia of the Bedbug, with special reference to a Unique Method of 
Mopulation.. @1oin.; (Lantern)! ecce. 622. oie s osc os P. B. WILTBERGER 
The Origin of the Gasserian and Profundus Ganglia in Rana. 5 min. 
RactpH A. KNnourF, introduced by F. L. LANDACRE 
The Fusion of the Gasserian and Profundus Ganglia in Plethodon. 5 min. 
KATHERINE OKEY, introduced by F. L. LANDACRE 
The Origin of the Placodal Ganglia in Squalus. 7 min. 
C. I. REED, introduced by F. L. LANDACRE 
Concerning Thyroid Glands in Amphibia. 10 min. (Lantern). 
R. A. BUDINGTON 
Feeding Thymus and Thyroid Extracts. 5min.............. E. P. DURRANT 
Notes on Protozoa. (a) A Review of the Arcellidae. (b) Supplement 
HOUMe ltrelestorebne., (\ieits\: 5 a5 ooo oOesonOnan Reet oon ooo L. B. WALTON 
INoteswon) Birdss slO)minee mere ae aero. oe wn See ee Ree er cit oeet © H. A. ALBYN 
A New Three-Salt Nutrient Solution for Sand and Water Cultures. 
110) iiibays we Ket ho nod Oso Ac 6 ou 30 Oa.0I Ce CRE e ee One one ck A. G. McCaLL 
An Adjustment of the Sliding Microtome for Cutting Lignified Tissue. 
2) TROUT es ac Se ER i chee ea Li, Sy aie pent aS Forest B. H. BROWN 
Notes on the Structure and Function of the Green Layer of the Bark of 
Wieadye Plants. 8 iui we (isamterl)' 2. ..5.....2-.2.++- Forest B. H. BROWN 
The Distribution of Fungi in Porto Rico. 10 min.............. Bruce FINK 
The Genus Physcia in Ohio. 10 min, 
MartHa McGInniss, introduced by BRucE FINK 
Decrease of Permeability with Age (Preliminary Note). 5 min. 
H. M. BENEDICT 
Methods of Spore Formation in the Zygnemales. 10 min....E. N, TRANSEAU 
