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worm seems to have attracted the greatest attention, and its cultivation is rapidly 
extending. M. Givelet, who published a report on the subject not long since, read a 
paper at the exhibition, and promises a more complete account of the best method of 
bringing this worm into cultivation on a large scale during the coming winter. This 
gentleman commenced planting the Ailanthus at the Chateau of Flamboin in 1860, 
and, after some misfortunes and disappointments, completely succeeded in the 
breeding and rearing of the worms. He reports that during the present season he 
has collected about twenty thousand cocoons, and that about three times that number 
are now on the trees in his plantation. The long continuance of hot weather had 
greatly favoured the experiments made in the rearing of Bombyx Cynthia. In the 
enclosure within the Jardin d’Acclimatation, in the Bois de Boulogne, may be seen at 
the present moment a Jarge number of these worms of the third generation of this 
season, feeding in the open air on the Ailanthus, or spinning their cocoons. The 
creatures are of great size, and seem to be in perfectly healthy condition. ‘The 
cocoons are geverally formed at the extreme end of the brauches, or rather of the 
leaves, for the Ailanthus has long compound leaves, with many leaflets, like the ash, 
where no bird, however light, could rest and make a meal of the occupant, and the 
worms take the curious precaution, before commencing the cocoon, to attach several 
threads of their web to the leaf-stalk as high as the third or fourth leaflet, so that, if 
that on which the cocvon is fixed were to be broken from its stalk, it would still be 
held pendant by these stay-threads. The Museum of Natural History at the Jardin 
des Plantes, contributed a fine collection of insects, with specimens of timber and 
other substances which have suffered from their ravages; also some remarkably large 
specimens of lobsters and crayfish from American waters. Another remarkable 
collection of insects is from Mr. T. Glover, the entomologist attached to the Depart- 
ment of Agriculture at Washington. M, E. Mocquerys, of Evreux, has an admirable 
exhibition of coleopterous and other insects which feed on the vine, cereals and other 
industrial plants. Dr. Eugéne Robert contributed a series of sections of trees ravaged 
by xylophagous insects, together with illustrations of the methods which have been 
adopted by the authorities of Paris and other places, under his superintendence, for 
their destruction. There were other collections of more or less importance, and, 
amongst the curiosities of the exhibition, a landscape produced entirely by the 
arrangement of various coloured beetles. Apparatus and powders for getting rid of 
certain classes of noxious insects were numerous in the exhibition, amongst which, 
judging from the number of medals and awards granted to the discoverer, the powder 
produced from the flowers of the Pyrethrum Willemoti seems to hold the highest 
place. It appears that the flowers of various plants of this family are extensively 
used in Persia, Armenia, and other countries, for like purposes. The Persian powder 
is said to be composed chiefly of the flowers of the Pyrethrum carneum, while the 
Armenians prefer the Pyrethrum roseum.” 
Dr, Alexander Wallace exhibited living specimens of Bombyx Cynthia in all its 
stages,—eggs, larve in four successive stages, cocoons and imago,—bred by him 
during the present year; also a branch of the Ailanthus glandulosa, having attached 
it to a paper cot containing eggs, to illustrate the mode in which the eggs were 
placed on the living tree out of doors the evening before hatching out. He also 
exhibited the mode of keeping the cocoons during the winter, strung up in chaplets of 
fifty each ; the perforated zine cylinders in which the moths were retained for copula- 
