- 
281 
Curious Case of Germination in Citrus decumana. W. G. Far- 
low. (Bot. Gaz. xvi. 179, 180). 
This is a note to the effect that a germinating seed, with 
green cotyledons and plumule, was found inside a fruit of the 
above species. A similar instance was given in the case ofa 
lemon [See Proc. Nat. Sci. Assn. S. I., Ocr. 8, 1887] indexed in 
the BULLETIN for Dec., 1887. 
Difficulty of Ascertaining the Age of Certain Species of Trees in 
Uruguay from the Number of Rings—On the. David Chris- 
tison. (Trans. and Proc. Bot. Soc. Eden, xviii, 447-455. 
Pl. iv). 
A valuable contribution to the much discussed subject of 
“annual rings.” Observations upon five species are given. 
The fact that seasonal variations cause rings similar to those 
caused by annual periods of rest and activity is noted, and in this 
connection the following words of the author are quoted: ‘“ The 
ages of the specimens cannot be determined with certainty by 
counting the rings on the blocks, except in Robinia. In Melia, 
zones of wood, sharply defined by lines of demarcation similar 
to those met with in our British trees, are seen, but the zones 
exceed in number the years of age of the tree. In the Acaciasa 
series of wave-like rings greatly surpass in number the years of 
age of the trees, and it is difficult or impossible to pick out the 
true demarcation of the yearly growths.’ Even with the aid of 
the microscope the author confesses the impossibility at times of 
distinguishing the annual from the seasonal growth. He also 
points out the desirability of making some distinction when speak- 
ing of the annual increment and the line of demarcation between 
such growths, suggesting that zoe be used to denote the former, 
and ving the latter. Aa ti: 
Doassansia, Cornu.— Preliminary Notes on the Species of. Wm. 
A. Setchell. (Cont. Crypt. Lab. Harv. Univ. xiv. Reprint 
from Proc. Am. Acad. Arts and Sci. xxvi. 13-19). 
Twelve species are described, the following as new: Doas- 
sansta opaca, (mentioned previously by Dr. Farlow under the 
name Protomyces Sagittarie), D. obscura, D. deformans. The fol- 
lowing new genera, with one species each, are described : Lurril/- 
ta pustulata and Cornuella Lemna. 
