April, '11] NORTON: health of plants as related to insects 269 



would not be very difficult to handle them at such receiving stations. 

 Even where a tremendous amount of stock is shipped into the state, 

 it would not always be necessary to handle every shipment. The 

 inspection office makes as close a study as possible of all outside nur- 

 series, doing business in the state, and these offices are generally well 

 informed as to the reliability of the various nurseries. This informa- 

 tion is a very convenient guide in handling interstate shipments. 

 Instead of establishing quarantine stations, were the law amended so 

 that every citizen would be required to notify the state inspection 

 office every time a shipment of nursery stock had arrived, the visiting 

 of the different places throughout the year would no doubt involve 

 a greater expense and loss of time than a system of receiving stations 

 where all stock is systematically inspected. The former would neces- 

 sitate the employment of county or district inspectors in order to 

 carry it out effectively. 



These are merely suggestions. It is difficult to foretell what the 

 efficiency of such a system would be without carrying out the experi- 

 ment. These suggestions are not intended to burden our reliable and 

 conscientious nurserymen but they are intended for all unscrupulous 

 nursery dealers. 



RESULTS OF EXPERIMENTS ON DIPPING TREES AND 

 FUMIGATING PEACH BUDS 



By T. B. Symons and E. N. Cory, College Park, Md. 



[Withdrawn for pnblication elsewhere.) 



jVIr. Headlee: I wish to say that in connection with our work 

 against mill insects, extended tests made to determine the formula, 

 which would give the maximum amount of gas in the minimum time, 

 indicated that the one now recom.mended by the Department of 

 Agriculture (1-1-3) is best. 



THE HEALTH OF PLANTS AS RELATED TO INSECTS 



By J. B. S. Norton, College Park, Md. 



The influence of insects upon plant health is enormous, as is wit- 

 nessed by the great expenditure of time and money on economic 

 entomology which is devoted mostly to protecting plants against this 

 division of the animal kingdom. In this land of specialization the 

 development of this branch of plant pathology by men specially inter- 

 ested in the insect has, as in the branch of fungous diseases developed 



