Campbell—Studies on the Araceae. 3 
Jamaica, as well as to obtain a number of forms which 
I had not had an opportunity to see before. This material 
has not yet been worked up, but promises some interesting 
results. 
A good deal of difficulty was experienced in the preserva¬ 
tion of specimens for histological study. This was especially 
the case in some of the larger species of Anthurium and 
Philodendron. Most of the Araceae develop a large amount 
of mucilage in the floral tissues, and especially about the 
young seeds. In case aqueous fixing media are employed, 
the swelling mucilage is very troublesome, and interferes 
seriously with the penetration of the fixing agents. It was 
by the employment of these aqueous media that much of my 
West Indian material was made useless. So far, the best 
results have been obtained by using a concentrated solution 
of corrosive sublimate in ordinary alcohol. In some cases 
10 °/ o of acetic acid was added to the solution. The specimens 
were embedded in paraffin, and the sections double-stained. 
As a general thing, the best results were obtained from 
a double stain of Bismarck-brown and aniline-water safra- 
nine. 
The more striking results as to the structure of the ovule 
in Lysichiton have already been published 1 , but the details 
of the embryo were not discussed. The present paper is 
mainly concerned with the further study of this species, and 
also with the results of a study of two forms collected in 
Jamaica— Dieffenbachia seguine and an unnamed Aglaonema 
collected in the Hope botanical gardens near Kingston. 
Some preliminary notes are also given on species of Anthurmm 
and Philodendron. 
The Araceae exhibit great variety in their flowers, which 
have been very thoroughly studied, especially by Schott 2 and 
Engler 3 . The flowers may be hermaphrodite and all similar, 
1 Campbell, Bot. Gazette, March, 1899. 
2 leones Aroidearum, Vienna, 1857. Schott: Genera Aroidearum, Vienna, 
1858. 
3 Engler : Vergleichende Untersnchungenuberdie morphologischen Verhaltnisse 
