1886. | Botany. 381 
measurement of ‘trees of known ages. The measurements were 
made at the uniform height of two feet above the ground. 
Circum- 
Common Name. Scientific Name. Years Old.| ference. 
( inches.) 
White Elm...... .....| Ulmus americana 15 243% 
a Savoye sss e a e E E 24 36 
Osage Orange...... «».| Maclura aurantiaca sisas ecce 25 26% 
Soft a ETIR sie kes Acer dasycarpum 18 543% 
Be E A * “ ; 18 694 
Box Elder Negundo aceroides ............ 14 254 
A hacen vides tas “ ra E EE TA 14 31% 
Honey Locust ........ Gleditschia triacanthos.. ....,... 22 40} 
A M eee ve ot ¢ s A TE TR 22 414% 
Black Locust. ........| Robinia pseud-acacia .......... 24 60% 
Kentucky Coffee tree .. Gymnocladus canadensis. ...... 14 25% 
ON ei ik eis di Platanus occidentalis. .......... 16 434 
Black Walnut. ........ Juglans nigra 22 48 
se Er AA 22 50% 
White Walnut .:...... Juglans cinerea. 22 49% 
Shagbark Hickory sxteli Carya alba. 24 30 
Ea a i aaa o] Cestation vesca, var. americana . 14 24% 
a ny Ce ae Quercus macrocarpa . 22 36% 
hahaa hy eee Quercus alba. 22 29 
reese Ash... cic] Fraxinus americana... .<+<.. $ 22 32% 
Green Ash ..... ......| Fraxinus viridis 22 x pg 
Cottonwood .......... Populus monilifera .......... <a] 23 as 
F Elster “ “ bv bes weber 23 9 
White Poit -a Pinus strobus . 20 36 
Scotch Pine ....., Ci cel Pinus sylvestris. ......... eeu 15 23 : 
Austrian Pine ....,... Pinus taricis, var 15 22% 
E e o a 
Botanica News.—Late numbers of Annales des Sciences 
Naturelles contain 
actual state 
_ More important A 
: Pringsheim’s Jahrbücher fir Wissenschaftliche Botanik 
Con 
5 aa De Vries’ Plasmolytic studies on the vacuole 
ege ty-eight plates. An interestin 
poy ex cular respiration, by: W. Pfeffer, is j 
ocust is ¢ 
5 tributions to a knowledge of the mechanical tissue systems of 
an ; 
wy 
are 
imper’s Investigations upon chlorophyll bodies, Tschirch’s _ 
hee 
