Mode of destroying Insects on Cadi. 657 



laburnum, weeping birch,"and that most beautiful of all weeping trees, the So- 

 phora japonica pendula Arb. Brit. When grafted high, this tree forms one of 

 the most dehghtful living vegetable umbrellas imaginable, especially when 

 trained en parasol. 



But leaving with regret the plants of the open air, where I pass over many 

 varieties unmentioned, I will give a hasty glance at the inmates of the green- 

 house. On entering it, I was much pleased with a splendid collection of 

 heaths, second to none in England for luxuriance of growth, and the size of 

 the specimens. Many were in full flower, and many more in an advanced 

 state. At the end of the house I observed a splendid specimen of Banksza 

 speciosa B. Mag. in full flower. This alone was a treat worth going to see. 

 There was also a very extraordinary specimen of Rhipidodendron plicatiHs 

 Hort. Brit., which is of a great age, and is sure to arrest the attention of 

 every visiter. The camellias looked well, as also did a quantity of iJhododen- 

 dron arboreum Smith. In one of the pits, the pitcher plant grows luxuriantly ; 

 for although this plant has generally been kept in a stove, yet it will stand in a 

 house where the thermometer falls below freezing, as I am told the individual 

 here did last winter ; for though it had the ice on its leaves as thick as a six- 

 pence, yet it did not suffer from it in the least. 



In a Dutch pit there were above 20 species of Kennedya and Zichy«, 

 being nearly all the sorts yet introduced into this country. There are two or 

 three species quite new that have not yet flowered ; also several other good 

 things, amongst v/hich I may notice Pronaya elegans, a climbing plant nearly 

 allied to-S611y«; also Convolvulus scopariiis, one of the rarest of the genus, 

 and perhaps not yet to be found in any other collection in England. I could 

 go on to enumerate many other good and rare plants which I saw here, but I 

 will only notice the following hardy trees and shrubs, which 1 believe are not 

 very common in the London nurseries, and which it may be useful to those 

 planting arboretums to know may be had from Mr. Young : Aralia japonica, 

 Atraphaxis spinosa, Nitraria Schoberi, Kadsura japonica, and Paulownza im- 

 perialis. 



If I do not meet with a situation soon, it is my intention to visit some of 

 the principal nurseries in different parts of the country, and then perhaps to 

 go to Scotland, and you shall hear from me accordingly, 



Bristol, September, 1840. 



Art. VI. HotK) to get rid of Insects that have attaclced the Cadi. By 

 M. Emil Sello. 



(Translated from the Garten Zeitung, by J. L.) 



It is well known to every gardener and cultivator of the Cacti, that the 

 expulsion of the insects so injurious and destructive to this tribe of plants 

 is particularly difficult to effect ; and it is also a fact, that the scale 

 which is found between the spines on the elevated parts and small protube- 

 rances of many species cannot be got rid of, without destroying the specimen. 

 Permit me, then, to make known to you a more suitable method, for the 

 expulsion of such injurious insects, than I ever saw in practice during my 

 journey. 



In the establishment of M. Makoy in Liege, a very simple and, there- 

 fore, easy method has been practised for a long time most successfully, 

 without the specimens on which it was employed sustaining the most trifling 

 injury. Such an operation is generally performed elsewhere by means of 

 a small brush, or other small kind of instrument, which occupies several 

 hours, and is frequently attended by the injury of the exterior of the 

 plant ; but here it is effected in the course of a i&w minutes, without the 

 plant sustaining any injury whatever. Many species of the Mammillaria, 



