and mosquitoes (or gnats), and if used with a pair of ordi- 
nary bellows is very effectual in killing the commoner 
insects that infest plants in rooms and houses. The powder 
burnt is not disagreeable to smell, and very effectual in 
rooms, wardrobes, and green-houses. The alcoholic extract 
of the powder diluted in water, the simple solution in water, 
and the decoction in water, are all most useful in cases 
where the powder may be less effectually applied. The 
disadvantages are, that the result is not permanent; after 
half an hour insects may reappear on the plants that had 
been cleared, and be unhurt. Again, actual contact with 
the insect is necessary in the open air; and powdering the 
upper side of a leaf has no effect on an insect on the under 
side. More important still are the facts that it has no 
effect on insects’ eggs, or hard chrysalises, on beetles with 
hard elytra, and on that vast class of hemiptera (true bugs); 
whilst hairy caterpillars and spiders of all kinds are proof 
against it. Hymenoptera again quickly succumb to its 
effects. | : 
The C. cinerariefolium is an old inhabitant of botanica 
gardens, flowering in July and August; but it has not been 
known till comparatively recently that it is the source of 
the Dalmatian insecticide. The correct specific name to be 
taken is disputable. That of Chrysanthemum cinerarie- 
folium is the earliest, but is only a part of a descriptive 
phrase, and is anti-Linnean; C. rigidum, Visiani, is the 
first reference of the plant to the modern genus Chrysan- 
themum, but this was altered by Visiani himself, first to C. 
Turreanum, and then to C. cinerariafolium, giving himself _ 
as authority for the latter, which, I think, is the most 
convenient to adopt.—J. D. H, 
Fig. 1, Receptacle ; 2, flower of ray ; 3, its style-arms; 4, flower of disk ; 6, its 
stamens and style; 7, its style-arms :—all enlarged. 
