Hearth and Home mentions the curious characteristics of many flowers opening and closing at different hours of the day.

"Some flowers close at night, some are closed during the day and open at night, and others again are almost as punctual in opening and closing as a good clock is in keeping time. Ornithogalum umbellatum is called in some places Lady-Eleven-o'clock, because it closes its flowers about 11 a. m; some species of Trago pogon, or Goatsbeard, close their flowers at noon, and hence have received the common name of Go-to-bed-at-noon. The Evening Primrose (CEnothera biennis) opens its flowers in the evening ; the Scarlet Pimpernel (Anagallis arvensis) is called the Poor Man's Weather-glass; it opens its flowers about 8 a. m., but closes them again if the day is likely to be rainy.

Linnaus constructed what he called a floral clock, wherein the time of the opening of certain flowers indicated the hours of the day. De Candolle also made one from observations in Paris, which we subjoin, giving the hours of waking or opening:

Ipomea purpurea........................

2

A. M.

" Nil.................................................

3 - 4

"

Matricaria suaveolens..............

4 - 5

"

Papaver nudicaule...............

5

"

Convovulus tricolor...........

5 - 6

"

" siculus.............................

6

"

Sonchus and Hieraoium, several species...............

6 -7

"

Nymphea and Lactuca " "

7

"

Specularia speculum..................

7 - 8

"

Anagallis arvensis.................

8

"

Nolana prostrata.........................

8 - 9

"

Calendula arvensis...........................

9

"

Arenaria rubra.......................

9 - 10

"

Mesembryanthemum nodiflorum...............

10 - 11

"

Ornithogalum umbellatum.............

11

"

Passiflora cerulea............................

12

M.

Pyrethrum oorymbosum..................

2

P. M.

Silene noctiflora........................

5 - 6

"

CEnothera biennis................................

6

"

Mirabilis Jalapa............................

6 - 7

"

Lychnis vespertina..................

7

"

Cereus grandiflorus....................

7 - 8

"