FHE 
AMERICAN 
ATURALIS 
A MONTHLY JOURNAL 
DEVOTED TO THE NATURAL SCIENCES 
IN THEIR WIDEST SENSE. 
MAY, 
I89I1. 
CONTENTS. 
PAGE | 
LIOTROPISM OF HYDRA, 
Eo Edmund B. Wilson, 
oli THE T n bt oe 
aur, 
“ss Sex 0 OLD Fort ss ve Ee, 
TH ap 
Growra-Preroprerry OF THE POTA 
- Conway Macuithiw. 
Sevens Complete al eee — 
ee s Report U 
i th 
— Pary West of the ne One- Hu iar 
453 
434 
455 
452 
a egies Period—Submarine aie of A 
EE —— aes : 
North American ms—The > Field 
Editon” "ot Gray’ s Manua The F Flora ai the 
Nebraska Plains 
en ervations on a ppm ate Develop- 
velopment —The Lower Ht J 
amy Amon a 
P tl —The Later Larval Deveopeeat of 
joxus—Development of the —_ Ba- 
ryology of Glires, . 
Ethnolory.— The Taasisi 
Congress ea y redarea and Preistorie a 
of Paris sha “neat tons onalamatd — 
sr Language — a seal Mi 
ots ss eae os 
PROCEEDINGS OF SCIENTIFIC SOCIETIES, c. * 
Screntirie News, - - - ee 
PHILADELPHIA: 
