36 THE CANADIAN ENTOMOLOGIST. 



capable of destroying the Phylloxera : ist, the sulpho-carbonate of 

 potassa, and 2d, coal-tar. Neither of these would injure the grape-plant. 

 Experiments made on a large scale at Cognac and Montpelier, France, by 

 delegates of the academy, were highly efficient. Both ingredients are 

 cheap, for the price of a kilogram of each does not exceed one franc. 

 The sulpho-carbonate of potassa is dissolved in water up to 37 Baume, 

 and 80 cubic centimeter ( if* liter) poured upon every diseased grape- 

 root. The best time is in November and March, the ground at that time 

 being moist and the insect sure to be in winter quarters. The expense 

 per vine amounts to about 10 centimes. Applying coal-tar, each root 

 receives about 2 kilograms of this liquid, when it will penetrate the 

 ground about 2 feet deep. In both cases the grape-louse is effectually 

 killed. I am. sir, &c, 



H. Erni, United States Consul. 



We also give extracts from the report of the international congress of 

 vineyardists, at Montpelier, France, October 28, 1874, on the same sub- 

 ject, from the Journal d' Agriculture Pratique, No. 46 : 



The floor was taken by Mr. H. Marcs, permanent secretary of the 

 agricultural society of Herault, and president of the ministerial com- 

 mission. He commenced by recalling to mind the experiments of 1872 

 and 1873, with the Phylloxera, which were unsatisfactory on account of 

 the invasion of the "pyrale." In 1872 a new experimental field was 

 selected, near Montpelier, belonging to M. Michel Termand. The 

 experiments commenced the 6th July, and comprise fifty-one. methods, 

 applied to squares of 25 vines each, the squares being separated by two 

 rows of untreated vines, left to serve as means of comparison, and to 

 prevent confusion in the effects of various modes of treatment. One 

 hundred and forty methods have since been tried in the same vineyard, 

 of which thirty-three were beneficial and nine injurious ; the others 

 appeared to have no effect. The most beneficial were as follows, the soil 

 being chalky and ferruginous : Potassium sulphate disolved in urine ; a 

 mixture of the sulphurized manure of Berre, colza cake, and ferric sul- 

 phate ; potassium sulphate dissolved in water ; potash soap dissolved in 

 water ; soot ; a mixture of farm-dung, Avood-ashes. and ammonium hydro- 

 chlorate ; cow-urine alone or with the addition of gas-tar. All the methods 

 which have proved advantageous are also manurial, especially the salts of 

 potash and ammonia. The injurious methods are those insecticides not 

 manures, as carbonic sulphide, turpentine, petroleum, gas-tar, and phenic 



