690 
Dec. 18. 
1839. 
May 24. 
Extracts from the Minute-Book of the Linnean Society. 
any greasy substance offers itself on the surface of the sea, too large 
to be readily swallowed, the Petrel with wings expanded runs back- 
ward, until the whole is gorged or a fragment torn away.” 
Read the following “ Notice of Cereus tetragonus.” By Edward 
Rudge, Esq., F.L.S. | 
* This plant, which has been constantly kept in my hot-house up- 
wards of twenty years, is a single stem between nine and ten feet in 
height from the roots. "The stem next the roots and for about a foot 
from thence is solid and four-sided, about three inches in width, 
with spines at its blunt angles; at the height of between three and 
four feet it becomes pentagonous, lobed at the angles, and within a 
foot and a half of the top it is hexagonous. It first began to bloom 
in the autumn of 1836, when it put out nineteen blossoms, open- 
ing soon after sunset, and closing again soon after sunrise. In the 
autumn of 1837 it produced eleven blossoms, and in 1838 thirteen 
flowers, chiefly near the top of the plant, one or two only appearing 
near the lower part, but all of them growing from the angles of the 
lobes and stem. "The colour of the petals is white, slightly tinged 
with green at the base. The anthers are yellow." 
A sketch of the flower, of the natural size, accompanied the 
notice. 
A Portrait of William Yarrell, Esq., F.L.S., painted by Mrs. Car- 
penter, was presented to the Society by the under-mentioned Gentle- 
men: viz. 
The Bishop of Norwich. J. S. Bowerbank, Esq. 
R. Brown, Esq. Lord Braybrooke. 
E. Forster, Esq. W. J. Broderip, Esq. 
—. Andrews, Esq. - —. Carpenter, Esq. 
The Rev. J. Barlow. J. G. Children, Esq. 
T. Bell, Esq. The Earl of Derby. 
J. J. Bennett, Esq. G. T. Fox, Esq. 
—. Bentley, Esq. J. E. Gray, Esq. 
J. E. Bicheno, Esq. J. H. Gurney, Esq. 
