On the Gaseovs Oxide of Azote. 213 



trees, in ground not watered at all, were much less attacked. 

 This convinces me that these were not the ordinary vermin 

 abundant in drv seasons. 



I was only able to protect my cherries a little, by cutting 

 off the extremities of the damaged branches. 



Several people had recourse to sulphur ; but I did not fol- 

 low that method. The smoke of sulphur destroys the insect, 

 I admit, but it is at least equally dangerous to the tree ; I 

 always prefer an aspersion of the tree with soap-suds. This 

 very year I experienced the good effects of it. I saw my 

 plum-trees look green again, and the insects abandon them. 

 The aspersion is very easily managed, by means of watering- 

 pots or small garden-engines. I have also employed a ley 

 of wood-ashes with the same success as soap and water. 



An observation equally importanj:. \vhich I have made is, 

 the great damage done this season in all orchards by the 

 caterpillar. As soon as they devoured the young leaves 

 they attacked the fruit. In spite of the great care taken in 

 spring to get rid of them, the number of these insects is in- 

 credible. I have seen them unite on the large branches, 

 fix their nests to them, and protect them by means of the 

 downy matter which covers the buds of the ensuing season. 

 Whatever precaution is taken, it is almost impossible not 

 to destroy these buds. It is only necessary to take off these 

 nests and burn them; and this is the only way of getting 

 rid of the coveys. I employed the same aspersion for my 

 apple-trees, and by that means got rid of their enemies also. 



XXXIX. Erperiments upon the Gaseoiis Oxide of Azote, 

 made at a Meeting of Avinteurs, of Toulouse. Described 

 ly M. DisPAN, Professor of Chemistry in the Institution 

 of thai City*. 



X* OR several years past, plenty of experiments have been 

 published on the effects of the gaseous oxide of af ote in- 

 haled into the lungs. But these experiments, almost always 



From /tnnales de Chimif, tome Ivi. 



O 4 different. 



