244 



efficacy of the fungicides, and the results fully warrant the extended 

 use of Bordeaux mixture upon such stocks. As early as June 134 

 the difference between treated and untreated sections was visible, 75 

 per cent of the foliage of the untreated being diseased, while the sec- 

 tions sprayed with Bordeaux mixture remained healthy. Plates xxi 

 and xxii show fairly well the contrast as it appeared on October 11, 

 the two rows standing only 3 feet apart. The difference consisted not 

 only in the presence of foliage on the treated and its absence on the un- 

 treated, but in an increased growth of the former, as is shown by weights 

 and measurements of the stocks given below. A calipering of these 

 stocks in 1S91 showed no appreciable average difference in diameter. 



DIAGRAM 1. Showing arrangement of treated and untreated rows. 



EXPLANATION OF DIAGRAM 1. 



A and B, treated 7 times in 1891 and G times iu 1892 with Bordeaux; C, control on 

 row opposite; D and E, treated three times in 1S91 and 5 times in 1892 with Bor- 

 deaux; F, control on row opposite. This portion of the experiment was situated on 

 rows VI, VII, and VIII, as indicated in Table 2, below, and in the plan on p. 257. 

 The unbudded portion alone is considered. 



TABLK 2. Showing ivcights and measurements of treated and untreated French pear stocks 



in November. 



The above data were secured in the following manner: The first week 

 in November each individual stock was dug carefully and the dirt 

 cleaned from the roots. It was then calipered and weighed. The top 

 was then cut off and weighed separately. These data are, perhaps, 

 the first published showing the superiority of treated pear seedlings in 

 other respects than that of foliage. As regards a comparison of the 

 two copper compounds, it will be sufficient to say that the Bordeaux 

 was in all respects superior to the ammoniaca! solution. In the order 

 of their eilieacy the four methods of treatment are as follows : Bordeaux, 



