THE GREENHOUSE AND CONSERVATORY 145 



until thoroughly dissolved, then disturb the water by means of the 

 syringe, otherwise the petroleum will float on the top. Lay the affected 

 plants on their side and syringe with the mixture. A good way to 

 keep the solution well mixed is to return each alternate syringe full to 

 the pail containing the mixture. Unless this plan is followed the crude 

 petroleum will quickly collect on the top, and in this undiluted form 

 injure the foliage. 



