— 93 — 
M. F. V. Theobald replied that : 
The effect of the arsenate of lead would last over the period of 
eoo- stage unless followed ivithin a few hours by heavy rain. The 
nicotine would also last until rained upon. 
So one spraying would do with arsenate of lead and probably one 
with nicotine. 
The nicotine used was i 1 5 o'/,. (98 0 „) nicotine. 
2 ozs. soft soap. 
10 gallons water. 
M. H. Rowland-Brown (Harrow-Weald). 
Asked whether, the soil not being treated, the Insect after 
falling to the ground was equally capable of returning to the attack, 
whether the soil be dry or not, M. Theobald replied that the 
state of the soil did not entirely affect the springing powers of the 
Collembola, and that they were active under either conditions 
of the soil, but most so in moisture. But that the application of 
insecticides to the soil either as corrosives, as paraffin emulsion, 
or corrosive and drying dressings of lime and soot, greatly lessened 
their numbers, by driving them away and killing large numbers. 
Sir Daniel Morris (Londres), ancien commissaire impérial de 
l’Agriculture, prend ensuite la parole et lit une note sur la : 
Legislation adopted in the British West Indies for controlling 
diseases on imported plants, and the methods in force for 
disinfecting imported seeds and plants by various insecticides 
proved successful in carrying out the objects in view. 
{Résumé.) 
The paper contained a summary of information recently 
published in the West Indian Bulletin , vol. X, pp. 197-234 and 
pp. 349-372, by Mr. H. A. Ballon, entomologist on the Staff of 
the Imperial Department of Agriculture. All the West India 
Colonies are now effectively protected against the introduction of 
diseases by imported plants, and further by a system of quarantine 
and inspection after the plants are imported. Growing plants in 
pots or packages are treated with hydrocyanic acid gas; seeds in 
