THE FLORAL WOELD AND GAEDEN GUIDE, 173 



of air must be given, and warm showers allowed to fall upon them, 

 yet a diminution of air may take place at three or four o'clock, p.m., 

 so as to shut up for a few hours during the evening a large amount 

 of solar heat, when more air may again be given. In autumn they 

 must be removed to the house, and if young stock are received from 

 the nursery in autumn, they must have all faded blossoms picked off, 

 and be placed in the heath-house until the following spring, when 

 they may be treated as already described. As soon as blossoms fade 

 they should always be cleared off the plants ; from slow growing 

 kinds they should be picked off, but the free-growing kinds may be 

 cut off, taking with them the points of the shoots. This will keep the 

 plants compact, and, as they attain to the size of specimens, potting 

 will be required less frequently, as they will stand and flower for 

 years in the same pot, with a little fresh surface dressing occasion- 

 ally ; but when potting is necessary, it may be done when the 

 pruning takes place, and if the plants can be put in a pit for a few 

 weeks, and treated to a little solar warmth, it will assist the new 

 growth. A puff of sulphur must occasionally be given amongst 

 them to keep off mildew, and the greatest care taken that the roots 

 are at all times kept iu a healthy state of moisture, and this by the 

 use of soft water alone ; no hard pump water or liquid-manure must 

 be given to the heath. Some cultivators know by the weight of the 

 pot if the soil be in a proper state of moisture ; others use, perhaps, 

 a better method, and one which may be soon acquired, viz., that of 

 tapping the pot with the knuckles, and listening to the sound. Any 

 one can easily learn this, by taking two pots, one of which is known 

 to be wet, the other dry, and practising upon them, observing at the 

 same time the difference of sound. A shade of tiffany thrown over 

 the heath-house or pit in bright weather, will tend to preserve the 

 foliage green and to promote their growth, but heavy shading should 

 be avoided. In turning out into the open air in summer, turn out 

 only the hardiest varieties for about six weeks during July and 

 August, and house again before the heavy rains set in, otherwise 

 they may saturate the soil, and injure the roots. Also be careful to 

 place them upon racks or concrete, so that no worms enter the pots ; 

 and choose a place for them shaded from the meridian sun, but ex- 

 posed to its morning and evening rays. 



CELERY FLY, AND THE SCOTCH SYSTEM OE 

 CELERY CULTURE. 



BY MR. JAMES CUTHILL, OP CAMBEEWELL. 



10 doubt it is much to the gardener's interest if he could 

 know the habits of the celery insect, as well as all 

 others that attack his crops ; but unfortunately he has 

 not the means to do so. Entomologists tell a long 

 story of the celery insect and others, and the book 

 comes to money. However, the celery insect lays dormant in the 



