24 
Botany 
The white waterlily of McGregor, Iowa: HENRY 
S. ConarD. 
The classification of plants: HENRY S. CoNARD. 
(a) An unusual black walnut. (b) An annual 
sweet clover. (c) Notes on the perennial my- 
celium of a few parasitic fungi: L. H. PAMMEL. 
Calls attention to the perennial mycelium of Usti- 
lago strieformis, Plasmopara Viticola, Urocystis 
Agropyrt. 
An ecological study of the weeds of some Iowa 
fields: R. S. Kirpy. The relation of weight and 
number of weeds to soil moisture and rate of 
growth of crops with their weight. 
The germination of some native Towa and exotic 
tree seeds: L. H. PAMMEL AND CHARLOTTE M. 
Kine. A continuation of the studies presented 
last year on the germination and juvenile condi- 
tions of some Iowa oaks. This study considers the 
germination and morphology of Juglans, Carya, 
Frazinus, Tilia, Acer and Pyrus. 
The vegetative organs of some perennial grasses: 
FLORENCE WILLEY. It is often difficult to rec- 
ognize grasses when they are in their vegeta- 
tive condition. This study considers the rhizomes 
and early leaf and culm characters of such grasses 
as Spartina cynosuroides, Muhlenbergia mexicana, 
Phragmites communis, Poa compressa, Agrostis 
alba, Bromus inermis, Agropyron repens, Agro- 
pyron Smithii and Sporobolus eryptandrus. 
Some anatomical notes on the plants of a prairie 
province: ADA HaypEN. The study includes a 
discussion of the comparative anatomy of plants in 
dry situations like Petalostemon violaceus, Liatris, 
Aster levis, Gentiana puberula and in moist situa- 
tions and swamps of such plants as Scirpus fluvia- 
tilis, S. validus, Sagittaria and Phragmites. 
Some phenological records of spring flowering 
plants of Henry county: H. E. JAQuzs. 
The fern flora of northeastern Iowa: T. J. Firz- 
PATRICK. This paper gives an enumeration of 
thirty-three species of ferns and fern allies occur- 
ring in a region of Iowa which is of great botan- 
ieal interest. Each species listed is accompanied 
by notes on occurrence, habitat, frequency, distri- 
bution, ete. 
The pollen and pistil in relation to the germina- 
tion of the pollen in five varieties of apples: JOHN 
N. Martin. This report deals with the conditions 
that control the germination of pollen, the struc- 
ture and function of the stigma as related to the 
germination of the pollen, and the external factors 
that may hinder the efficiency of pollination. 
SCIENCE 
'N. 8. Vou. XLVIII. No. 1227 
The structure of the seed coat and its relation to 
the germination of the seeds of the two common 
sweet clovers: JOHN N. Martin. This reports the 
results of investigation on the structure of the seed 
coat with the aim of determining the difference be- 
tween the structures of the seed coats of hard 
seeds and soft seeds and just what structure pre- 
vents the entrance of water in case of hard seeds. 
Cytological study of the abortion of the pollen 
in the Winesap: JouN N. Martin. This variety 
of apple in Iowa often fails to produce good pol- 
len. The abortion of pollen in plants is consid- 
ered indicative of hybridism. The aim of this 
work on the Winesap was to trace cytologically the 
steps in the abortion of pollen from the mother- 
cell stage until the flowers were mature. 
The endosperm of Utricularia: Ropert B. WYLIE 
AND ALICE Yocom. 
A miniature Vallisneria: Ropert B. WYLIE. 
Notes on an introduced woodland flora: R. I. 
Cratry. An artificial grove planted in Emmett 
county in early days was left in such condition that 
an interesting woodland flora was introduced. i 
A study in cereal roots: R. O. WESTLEY AND 
A. L. BAKKE. : 
Pioneer plants on a new levee IV: FRANK E, A.. 
THONE. 
Eradication of the Barberry in the spring wheat 
sections of the United States with special refer- 
ence to Iowa: I. E. MELHUS. 
Plants of southeastern Alaska: J. P. ANDERSON. 
This gives a systematic list with notes of about 
425 species of plants collected in southeastern 
Alaska, mostly in the vicinities of Sitka and 
Juneau, during the years 1914 to 1917 inelusive- 
(To be concluded) 
JAMES H. LEES, 
Secretary 
SCIENCE 
A Weekly Journal devoted to the Advancement of 
Science, publishing the official notices and pro- 
ceedings of the American Association for 
the Advancement of Science 
Published every Friday by 
THE SCIENCE PRESS 
LANCASTER, PA. GARRISON, N. Y. 
NEW YORK, N. Y. 
Entered in the post-office at Lancaster, Pa., as second class matter 
