38 



Record of weather from. March 4, 1902, to May SI, 1902, in connedion with lime, salt, and 

 sulpjmr experiment at College Park, Md. 



Date. 



Precipi- 

 tation. 



Marcli 



April 



Character of 

 weather. 



Clear. 



Clear. 

 Clear. 



Cloudy. 

 Cloudy. 

 Cloudy 



Part cloudy. 

 Clear. 



Cloudy. 

 Part cloudy. 

 Clear. 



Clear. 



Date. 



[ April 



1... 

 2... 

 3-«. 



8-10. 

 11 



12.... 

 13.... 

 14-17. 

 18 



19 



20 



21-22. 



23 



24-25. 

 26 



27 



Precipi- 

 tation. 



Inches. 

 0.31 



.14 

 .19 



.09 



28.... 

 29-31. 



Trace.. 



Character of 

 weather. 



Clear. 



Clear. 

 Clear. 



Clear. 



Clear. 



Part cloudy. 

 Clear. 



Clear. 

 Part cloudy. 



Part cloudy. 

 Clear. 



As will be noted in the table, there were 1.48 inches precipitation on 

 the night and succeeding day following the application. There was a 

 light rain of 0.34 inch on March 12, eight days after date of applica- 

 tion. A light rain also occurred on the 16th, and 0.71 inch fell on 

 the 28th, with a precipitation of 0.31 inch during the 29th and 30th. 

 There was thus a total precipitation from March 4 to 31 of 3.13 inches. 

 During April rain fell at seven different times, with a total for the 

 month of 2.25 inches. During May rain fell on eight different dates, 

 with a total of 2.70 inches. 



Frequent examinations of the treated trees were made to note the 

 effect of the wash on the scales. The earlier examinations indicated 

 that a very large percentage of the scales had been killed. Later 

 examinations, however, showed that these estimates had been placed 

 too high, and in the final examination, on June 2, of many branches and 

 twigs from diffei-ent trees the percentage of scale killed was placed at 

 from 55 to 60 per cent. At this time the young lice were very abun- 

 dant, many having settled on the limV>s, leaves, and fruit. -Scraping 

 the infested branches with a knife revealed the bright, yellow bodies 

 of the mature females in great nuinl)i'rs, and running the blade flat- 

 wise pressed out an abundance of oily fluid from the scales. 



