No. « DFIPARTMRNT OF A Ci R JCUI.TURK 475 



patient, but oau infeut or introduce the disease only after a lapse of 

 ten or twelve days. Before this time the bite of this infected mos- 

 quito is harmless, therefore, it seems only reasonable to conclude 

 that the organism passes through certain stages necessary in its 

 development to reach the condition in which it is able to re-enter 

 the human frame and infect susceptible persons. During the pre- 

 valence of Yellow Fever at New Orleans last summer, Dr. Dixon, 

 the State Health Officer, had, through the Entomologists of the 

 Academy of Natural Sciences an investigation made of fruit vessels 

 coming into the harbor of Philadelphia, for Yellow Fever infested 

 mosquitoes. 



Frequently epidemics break out in isolated rural communities for 

 which there is no apparent cause, and for which the local physi- 

 sian cannot discover any definite reason. Such cases should be re- 

 ferred to the Health Department, the cause identified and the remedy 

 applied. We all know that about the farm, building conditions ex- 

 ist which breed enormous numbers of unnecessary flies and mos- 

 quitoes. Rational hygiene demands the removal of these conditions 

 and the extermination of flies and mosquitoes as well as any other 

 biting insects. We would, therefore, suggest that this Board assist 

 the Health Department in its efforts to induce the farmer to create 

 such hygienic conditions about his premises that infection and con- 

 tagion of his own family cannot take place on his farm, nor of any of 

 those who use his products, for if it is worth while fighting the San 

 Jose" Scale, it is certainly worth while creating healthy conditions 

 about the barn and destroy breeding places for insects. 



It was moved and seconded that the report be received, placed on 

 file and printed. Agreed to. 



The CHAIRMAN : We will now take up the Report of the Com- 

 mittee on Forestry, Mr. Irvin C. Williams, Chairman. 



Mr. Williams presented and read his report as follows: 



REPORT OF THE COMMITTEE ON FORESTRY. 



By I. C. Williams, Esq. Deputy Commissioner of Forestry, Chairman. 



Forestry in this Commonwealth is advancing by slow but sure 

 strides. It is a rule of the Department that the work shall proceed 

 no faster than public opinion will commend. For this reason a slow 

 and steady growth, sure of its ground as it advances, is preferable, 

 with no sudden innovation or unusual and spectacular effort. 



The business of forest protection, preservation, and restoration 

 in Pennsylvania is purely a business, dictated by the laws govern- 

 ing good" business policy. The Commonwealth has committed her- 

 self to this work and from it there can be and ought to be no re- 

 treat. The necessity for forest preservation is as urgent as ever, 

 with the added idea that it is a necessity becoming more accen- 

 tuated vear bv v^ar 



