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on the secretion of water in. Tecoma grandifiora Loisel and Katalpa 
Kaempferi S. et Z. and on the Yerbenaceae: Clerodendron tricho- 
tomum Thunb. and Cl squamatum Vahl and by Nils Svbdelius 1 ) 
on the water-calyces of tropical Convolvulaceae especially in Sticto- 
cardia tiliaefolia (Choisy) Hallier and Operculina Turpethum (L.) Peter. 
Amongst other results these investigations have shown : 
1. that glands which secrete, the water, often at first produce muci¬ 
lage, as was also found to be the case with the epidermal glands of the 
leaves, and that only in a single case i. e. in Tecoma grandiflom , 
the calyx-water reduced Fehling’s solution. 
2. that the secretion of water on the inner surface of the calyx 
can begin at widely different, stages of development of the flower; 
in many of the plants mentioned it begins very early, when the 
corolla and the sexual organs are first laid down, and ends towards 
the flowering period, but in Jochroma. macrocalyx, Clerodendron 
Minahassae and Juanulloa parasitica the secretion of water continues 
during the time of flowering even up to the formation of the fruit. 
Svedflius afterwards showed that in the above-mentioned Convol¬ 
vulaceae the real secretion of water only begins after fertilisation, 
when the calyx-leaves continue to grow with the fruit. 
3. that trichomes, of the same structure as those which secrete 
water on the inner surface of the calyx, may also be found else¬ 
where in the flower, especially on the outer surface of the calyx 
and the inner- and outer surfaces of the corolla. 
This last point is especially important in interpreting the phenomenon. 
Koorders mentions in this connexion, that such trichomes occur 
in large numbers on the outside of the calyx in Nicandra. physa- 
loides, Kigelia pinnata, Stereospermum hypostictum and Clerodendron 
Minahassae. They are laid down at a very early age, earlier than 
those of the inside, but often they already begin to die off, when 
those of the inner surface have scarcely begun to secrete water. 
Shibata made the same observation with regard to the flowers of 
Tecoma grandiflom and Svbdelius observed also in Stictocardia 
tiluiefolia that, at a very early stage, the outside of the calyx is' 
already covered with many small peltate glands. 
Concerning the glands on the corolla, Trkub mentions that in 
Spatkodea campanulata , the cushion-shaped trichomes of the inner 
surface of the calyx * are afterwards reduplicated on the inside of the 
corolla, when the flower-buds have already undergone considerable 
development; Koorders found similar corollar glands in most of the 
*) Nils Svedeuus. Ueber das postflorale Wachstum der Kelehblatter einiger Con- 
volvulaceen. Flora, Bd. 96. Jahrg. 1906. 
