WINTER INJURY 



277 



trees, in various parts of the grounds, were also whitened." 

 The following table gives the results on time of blooming: 



Table LXXXIII 



effect of whitewashing peach trees to delay bloom 

 (after whitten) 



As a more striking effect of the winter on the treated and 

 untreated trees, it is recorded that 80 per cent of whitened 

 buds passed the winter safely when only 20 per cent of the 

 unwhitened ones were unharmed. 



A very interesting set of experiments was conducted to 

 illustrate the difference in absorption of heat between white 

 and colored material. Thermometers were covered with 

 various colored cloth and whitewash and exposed in the 

 orchard and on the side of a building. When the sun was 

 not shining the thennometers registered much the same, 

 but when the sunlight was intense marked differences oc- 

 curred. "At one time, during bright sunshine a difference 

 of 21 degrees was recorded between the white covered and 

 the purple covered thermometers. A difference of 10 to 15 

 degrees was frequently noted between these two. This is 

 sufficient to indicate that we might expect considerable dif- 



