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the Commissioner of Agriculture of the United States, 
before mentioned, it will he found in the observations 
tendered by Prof. Riley, from Mr. D. W. Coquillett, and 
likewise from Mr. Albert Koebele, of Alameda, California, 
that these points are minutely dealt with. 
In these observations are given as to effects, good or 
bad, of caustic potash and caustic soda, hard soap, soft- 
soap, kerosene emulsions, tobacco, tobacco-soap, sheep- 
dip, vinegar and Paris-green, bisulphide of carbon, resin- 
soap, whale-oil, &c.; and, besides methods of and 
appliances for throwing the washes, and methods of 
mixing or preparing the same, notes are given of little 
less than 153 experiments tried by Mr. Albert Koebele, 
with mention of material used, proportion of water added, 
and the results of the application. ’ 
Before offering some remarks on two of the African 
parasites of this insect, I close this attempt to offer some 
observations on the Iceryci purchasi , its habits and treat¬ 
ment in South Africa, with the strong recommendation 
to all concerned to endeavour as soon as possible to gain 
possession of the paper, which I have already alluded to, 
by Prof. Riley, and there study the history, the nature, 
and the means of prevention of the pest in the trust¬ 
worthy, masterly, and exhaustive reports with which he 
benefits all who suffer from the scourge. I desire also 
to add one little word on my own account,—that it was 
before we knew the subject was to be taken up by such a 
master-hand that I was applied to from Port Elizabeth 
to gam for them from our greatest European authority 
the scientific name of the so-called Australian Bug 
found there, and to form for them a simple paper which 
such as had both little time and care to read scientific 
treatises might learn something from. To do this to the 
best of my power has involved correspondence with the 
most distant parts of the world, and long delays, as I 
desired to make up for my own inability to study the 
subject in its adopted land by the most careful personal 
verification, study of such specimens as were sent to me, 
and comparison of documents. Now that my little 
