Page:EB1911 - Volume 16.djvu/48

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34
LABYRINTHULIDEA


kept broadest at the base and narrowed upwards, which prevents it from getting thin and bare below by the stronger growth being drawn to the tops.

The maze in the gardens at Hampton Court Palace (fig. 4) is considered one of the finest examples in England. It was planted in the early part of the reign of William III., though it has been supposed that a maze had existed there since the time of Henry VIII. It is constructed on the hedge and alley system, and was, it is believed, originally planted with hornbeam, but many of the plants have been replaced by hollies, yews, &c., so that the vegetation is mixed. The walks are about half a mile in length, and the ground occupied is a little over a quarter of an acre. The centre contains two large trees, with a seat beneath each. The key to reach this resting place is to keep the right hand continuously in contact with the hedge from first to last, going round all the stops.

Fig. 6.—Labyrinth in Horticultural Society’s Garden.

The maze in the gardens at Somerleyton Hall, near Lowestoft (fig. 5), was designed by Mr John Thomas. The hedges are of English yew, are about 61/2 ft. high, and have been planted about sixty years. In the centre is a grass mound, raised to the height of the hedges, and on this mound is a pagoda, approached by a curved grass path. At the two corners on the western side are banks of laurels 15 or 16 ft. high. On each side of the hedges throughout the labyrinth is a small strip of grass.

There was also a labyrinth at Theobald’s Park, near Cheshunt, when this place passed from the earl of Salisbury into the possession of James I. Another is said to have existed at Wimbledon House, the seat of Earl Spencer, which was probably laid out by Brown in the 18th century. There is an interesting labyrinth, somewhat after the plan of fig. 2, at Mistley Place, Manningtree.

When the gardens of the Royal Horticultural Society at South Kensington were being planned, Albert, Prince Consort, the president of the society, especially desired that there should be a maze formed in the ante-garden, which was made in the form shown in fig. 6. This labyrinth, designed by Lieut. W. A. Nesfield, was for many years the chief point of attraction to the younger visitors to the gardens; but it was allowed to go to ruin, and had to be destroyed. The gardens themselves are now built over.  (T. Mo.) 

LABYRINTHULIDEA, the name given by Sir Ray Lankester (1885) to Sarcodina (q.v.) forming a reticulate plasmodium, the denser masses united by fine pseudopodical threads, hardly distinct from some Proteomyxa, such as Archerina.

Labyrinthulidea.

1. A colony or “cell-heap” of Labyrinthula vitellina, Cienk., crawling upon an Alga.

2. A colony or “cell-heap” of Chlamydomyxa labyrinthuloides, Archer, with fully expanded network of threads on which the oat-shaped corpuscles (cells) are moving. o, Is an ingested food particle; at c a portion of the general protoplasm has detached itself and become encysted.

3. A portion of the network of Labyrinthula vitellina, Cienk., more highly magnified. p, Protoplasmic mass apparently produced by fusion of several filaments. p′, Fusion of several cells which have lost their definite spindle-shaped contour. s, Corpuscles which have become spherical and are no longer moving (perhaps about to be encysted).

4. A single spindle cell and threads of Labyrinthula macrocystis, Cienk. n, Nucleus.

5. A group of encysted cells of L. Macrocystis, embedded in a tough secretion.

6, 7. Encysted cells of L. macrocystis, with enclosed protoplasm divided into four spores.

8, 9. Transverse division of a non-encysted spindle-cell of L. macrocystis.

This is a small and heterogeneous group. Labyrinthula, discovered by L. Cienkowsky, forms a network of relatively stiff threads on which are scattered large spindle-shaped enlargements, each representing an amoeba, with a single nucleus. The threads are pseudopods, very slowly emitted and withdrawn. The amoebae multiply by fission in the active state. The nearest approach to a “reproductive” state is the approximation of the amoebae, and their separate encystment in an irregular heap,