The Embryo-Sac of Peperomia. 
BY 
DOUGLAS HOUGHTON CAMPBELL, 
Professor of Botany in the Stanford University, California , U.S.A . 
With Plate VI. 
URING the summer of 1899 the writer collected at the 
-L' Royal Botanic Gardens at Kew several species of 
Peperomia , with a view to investigating the development 
of the embryo-sac and embryo. A preliminary study was 
made soon after, the more important results of which were 
afterwards published h 
Since the writer’s account appeared, the same species has 
been investigated by Dr. D. S. Johnson 2 , who has confirmed 
the most important discovery brought out in the former 
paper — namely, the presence of sixteen nuclei in the un- 
fertilized embryo-sac ; but he at the same time called attention 
to an error in the interpretation of the structures found in the 
older embryo-sac. 
1 Die Entwickelung des Embryosackes von Peperomia pellucida. Ber. der 
Deutschen Botanischen Gesellschaft, Bd. xvii, Heft io, 1899. A preliminary 
note appeared in the Annals of Botany for December, 1899. 
2 On the Endosperm and Embryo of Peperomia pellucida ; Bot, Gazette, xxx, 
No. 1, July, 1900. 
[Annals of Botany, Vol, XV. No. LVIL March, 1901. j 
