Bi 
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3 
LINNEAN SOCIETY OF LONDON. 93 
rature within the tissues and causes the loss of water. The only 
additional facts advanced, and that tentatively, are, that yellow 
ight has a retarding influence upon transpiration, and that ‘life” 
has a retarding influence upon evaporation as distinct from trans- 
piration.—A paper was read by Sir Joseph D. Hooker, ‘‘ On Castilloa 
elastica Cervantes, and some allied plants.” The author states 
that under the name Castilloa elastica probably more than one 
December 17. — Frank Crisp, LL.B., Vice-Pres. and Treasurer, 
im the chair. — Dr. Maxwell Masters showed a branch with leaves 
and fruit of Heritiera littoralis var. macrophylla, received from Prof. 
Cornu, of the Jardin des Plantes, Paris. ‘The adult leaves were of 
“8e size, deep green e, silve 
from H. littoralis, but the points relied on to distinguish the tw 
Were not in Dr. Masters’ experience constant. Flowering specimen 
also been received from Mr. Baxter, of the Oxford Botanic 
smunda regalis from Pocies) near Barton; and from various 
localities seeds of Thalictrum, Ranunculus aquatilis, Nuphar lutea, 
“wus baccata, Hippuris vulgaris, Potamogeton heterophyllus, e. 
crispus, P. trichoides, P. flabellatus, Zannichellia palustris, Rumex 
waritimus, and Ceratophylium demersum, all in a remarkably fine 
condition of preservation. — Mr. Thos. Christy exhibited a plant 
Of dngrecum sesquipedale in flower, and a plant of Catasetum purum 
showing flowers erect and reversed on the same spike. none of 
the flowers was the ovary visibly twisted, but in ——— 
orchids it is often very difficult to detect the twisting of the ovary 
