2o8 
Rose Jordan. 
Mr. Worsdell exhibited an interesting case of hermaphroditism 
in the flowers of Begonia. The inferior ovary was more or less 
degraded, and in one ease a probably carpellary superior outgrowth 
from the receptacle was present. A head of Scabiosa atro-purpurea 
with virescent ray-florets and a double head of Chrysanthemum 
were also exhibited. 
Mr.VV. G. Freeman, Superintendantof the Economic Collections 
at the Imperial Institute, read a paper on the Uses of a Museum of 
Economic Botany, which will be published in the next number of 
this journal. He exhibited an interesting series of specimens and 
photographs from the Museum of the Imperial Institute, by per¬ 
mission of the Director, illustrating among other things coffee- 
growing in the Malay Peninsula, with coffee berries in various 
states of preparation, sugar obtained from the sugar-palm Arenga 
sacellarijera) and from the coco-nut palm, ad ammar-torch, various 
kinds of rattans, etc. 
ON SOME PECULIAR TYLOSES IN 
CUCUMIS SATIVUS. 
By Rose Jordan, B.Sc. 
HE history of the occurrence and structure of tyloses was 
summed up in 1888 by Dr. Hans Molisch in his paper: “ Zur 
Kenntniss der Thyllen, nebst Beobachtungen iiber Wundheilung in 
der Pflanze.” Molisch describes the formation of both parenchy¬ 
matous and sclerenchymatous tyloses, suggesting the various 
functions probably performed by these outgrowths into the xylem 
vessels of neighbouring parenchymatous cells. 
He finds that as a rule woody stems give rise to tyloses with 
lignified walls, whereas in herbaceous plants thick-walled tyloses are 
of rarer occurrence. The sclerenchymatous tyloses figured by 
Molisch occur in the wood-vessels of Piratinera guianensis and 
Mespilodaphne Sassafras; they possess a narrow lumen and a thick 
lignified wall exhibiting very distinct concentric stratification. 
These tyloses completely fill the lumen of the vessel in which they 
occur and are connected with one another by pits. 
In the herbaceous stems of Cncnrbita and Cucumis the tyloses 
are usually thin-walled and may be found in two stages of develop¬ 
ment :—(i.) either as small outgrowths, more or less rounded, in the 
