THE PHYLLOXERA, OR GRAPE LOUSE OF THE VINE. 127 



carefully as possible tlie insects already accumulated on 

 the roots that cannot be removed, or that are grafted. This 

 is important as a means of removing danger from the 

 vicinity of the vines not affected, or of reducing the force 

 of the invasions, and a protection to the young roots of 

 the resistant stocks, which, while they resist, may be, in a 

 measure, checked in growth by the efforts of the insects 

 to maintain their position. The bisulphide of carbon and 

 the sulpho-carbonate of potassium are the best known 

 remedies for disinfecting diseased spots. 



Eighth. — That although submersion of infected spots 

 may preserve a vineyard whenever practicable if practised 

 annually after the disease is known to exist in it, yet the 

 simplest and cheapest remedy, even where the land is 

 level and water plentiful, will be found in using resistant 

 vines as substitutes, this being a permanent defence. 



Ninth. — That all vine growers should commence by 

 experimenting at once with the best known resistant 

 stocks in limited numbers, so as to determine, in case of 

 need, which varieties will flourish best in their soils, and 

 to afford themselves and their workmen the opportunity 

 to learn by practice the simple art of grafting." 



A very interesting and useful chapter, in tabulated 

 form, I have taken from Dr. Kirk's book, as the infor- 

 mation ought to be extremely valuable to those about to 

 plant resistant stocks. Dr. Kirk says : — " Early in the 

 study of the subject it was found that the nature of the 

 soil had a very marked influence on the success of the 

 different sorts named as stocks. The subject has now 

 been fully investigated in France, and the latest researches 

 are formulated by the Experimental School at Montpellier 

 in the statement quoted below, which will be of interest 

 as giving the various classes of soils, together with the 

 American vines best adapted to each : — 



1. New, deep, fertile, soil : — Riparia (tomentous and 

 glabrous), *Jacquiez, Solonis, Viala, Taylor and Cunning- 

 ham. 



* According to experiments which have been made by the Agricultural 

 Society of Herault, as quoted in the Cajje Agricultural Journal, it has been 

 decided that the ' ' Jacquiez " is not suited for a graft bearer, but on its own roots 

 no exception need be taken as to growth. 



