206 TRANSACTIONS OF THE ILLINOIS 



In the case of the sulpho-carbonate of potassium, over and above its toxic 

 effect, it has a direct invigorating influence upon the vine, as the carbon- 

 ate of potassium is an excellent manure. 



"The employment of the sulpho-carbonates as a means for the destruc- 

 tion of the Phylloxera was suggested to M. Dumas by the clearly recog- 

 nized need that there was for some substance that would evaporate less 

 quickly than the bi-sulphide of carbon ; he saw that it was necessary to 

 apply the insecticides in some combination which would fix them and 

 only allow them to evaporate gradually, so that their action might con- 

 tinue long enough in any one place to infect with their vapors all the sur- 

 rounding soil. 



" But the task of eradicating the Phylloxera has by no means been 

 accomplished by the mere discovery of the value for the purpose of these 

 substances ; there is the further difficulty of applying them to the vine in 

 cultivation. One thing seems very certain, that in order to render the 

 sulpho-carbonates available they should be reduced to a powder and 

 spread over the ground before the heavy rains, that is, between October 

 and March, which will probably prove very efficacious. 



"The conclusion at which M. Mouillefert arrives at the end of the 

 report, is that the efficacy of the sulpho-carbonates is proved, and all that 

 is necessary is to bring to perfection their employment in agriculture, 

 which can only be accomplished by the intelligence and practical knowl- 

 edge of the vine-grower, who is well able to discover the economic pro- 

 cesses of culture which are conducive to their successful application. 



"He ends by saying that ' Scence has accomplished its mission, and 

 it remains for Agriculture to fulfill its part in the eradication of the Phyl- 

 loxera from the vineyards of France.' " 



A LIST OF THE VARIOUS PLANTS MENTIONED, WITH THE SCIENTIFIC NAMES OF THE 



PLANT-LICE INFESTING THEM. 



Alder. Lachnus alnifoliae; Eriosoma tessellata. 



Almond. Aphis amygdali. 



Apple, root. Eriosoma lanigera (Pemphigus pyri). 



trunk and branches. Eriosoma lanigera. 



leaves and twigs. Aphis mali. 



leaves. Aphis malifolia;. 

 Asclepias. (See Milkweed.) 

 Balm of Gilead. Aphis candicans. 



Balsam Poplar. Pemphigus popularia; P. populi-globuli ; P. populi-vence. 

 Barley. Aphis aven?e. 

 Bean. Aphis rumicis. 

 Beech. Eriosoma imbricator. 

 Berberry. Aphis berberidis. 

 Birch. Apis betuUi;colens. 

 Blackberry. Aphis rubi. 

 Bramble. Aphis rubi. 

 Cabbage. Aphis brassicte. 



Calamus. Diraphia calamorum ; D. maculipennis. 

 Carrot. Aphis dauci. 



