260 OBSERVATIONS ON THE CULTURE, &c. OF THE GENUS ISOPOGON. 
/. spharocephalus. — This is a free grower, forming a bush three or four feet high. 
The flowers are bright yellow, collected in several crowded spherical heads, and 
make a very good appearance. Seeds were collected at Swan Kiver by Mr. James 
Drummond, who sent them to the Royal Gardens of Kew. — Bot. Mag., 4332. 
I. teretifolius, — Flowers dull white, and produced in April. The plant was 
introduced from New Holland in 1824. 
I. trilobus.- — Flowers pinkish-white, produced in spring, and the plant introduced 
in 1803. 
The most beautiful of the above are Baccteri, corniger, formosns, Loitdoni, 
roseus* s.cabra, and sphcerocepliahis.. 
The culture of all the species is alike, and although they were formerly 
considered difficult to keep, now, since their habits have become better understood, 
they are found to require very little more trouble than the most common greenhouse 
plants. 
The soil in which they are potted should be composed of equal parts light 
sandy loam, heath-mould and sharp sand well mixed, but not too finely broken ; 
and it is always best if gathered not too long before being used, for the plants never 
seem to enjoy themselves so well in a soil which has been long thrown together 
in a heap. 
Like all proteaceous plants, these require in potting, a large portion of 
drainage. Lay a considerable quantity of broken potsherds at the bottom of each 
pot, and likewise a few pieces of wood charcoal ; also mix a portion of each through 
the soil. 
Although they are not so tenacious of being cramped at the roots as Protects or 
Hakeas, yet it is very advisable to give them plenty of pot-room, especially if the 
plants are ever placed out of doors during summer, which, however, is not to 
be recommended. 
Proteacls are remarkable for the tenderness of their roots, and these plants are 
not exceptions ; it is therefore best never to allow the soil in the pots to become very 
dry ; but if water be regularly supplied with caution, so that both the extremes of 
either drought or over-moisture be avoided, their roots will make rapid progress. 
In the summer season the plants may be placed in any part of the greenhouse 
where they can receive plenty of light and air, but they will never live if crowded 
amongst Pelargoniums or other heavy-growing plants, where from the close confine- 
ment they are unable to breathe freely. In winter, when the temperature is low 
and full of moisture, this caution is especially necessary ; indeed, at that time, the 
nearer they are placed to the glass the better, provided there is no danger of the 
frost reaching them. 
Propagation is effected by cuttings and seeds. Cuttings of the ripened wood 
are taken off at a joint, planted thinly in pots of fine sand, and placed under a 
hand-glass, but not in heat, as that would destroy them at once. Remove the 
glass occasionally to allow them to dry, as they are very liable to damp off. Water 
