CORNELL UNIVERSITY EXPERIMENT STATION BULLETINS. 307 



affect the prevalence of the disease? These and many similar questions 

 still demand the attention of apple-growers, and any notes that may throw 

 light upon this subject will receive attention if reported to this station. 



[The tables referred to are so long and at the same time so inconclusive 

 that it is not deemed worth while to reproduce them. — Secretary. 



It is difficult to draw conclusions from the above table. Many of the 

 varieties are mentioned only once and this is not sufficient evidence to 

 show their power of resisting the attacts of fungi. The system of tabula- 

 tion does not show accurately the comparative value of the different 

 varieties, even those which have been reported by several growers. Taken 

 as a whole, however, the table shows a gradually increasing susceptibility 

 to injury as the list is followed from the first to the last. 



Twenty-one varieties have been reported in the "Free'' columns only; 

 but of these not one was reported more than once, so it is obviously unfair 

 to say that there are varieties which are not subject to the attacks of fungi. 

 In going down the list it is seen that as soon as more than one observer 

 mentions a variety it also falls into another column, showing that one 

 observation is insufficient. Many varieties are found in the three columns, 

 but here fairly accurate conclusions may be drawn by a comparison of the 

 figures. It may be assumed that the Baldwin, Seek-no-Further, Astrachan, 

 and some others are comparatively free from scab, while the Wine Sap, 

 Early Harvest, Ked June and others are much injured. Many varieties 

 are placed high on the list because some observer reported them free in a 

 certain locality, and still the large majority of reports place them in one 

 of the two remaining columns. 



Following the above is a long list of varieties which were mentioned 

 only in the column marked "Not seriously affected." No conclusion can 

 be drawn from this list. Where more observations have been made the 

 following varieties may be said to be fairly free: Lucy Pew, Roman Stem, 

 Rhode Island Greening, and Rawle Janet, although the last two are also 

 reported in the first column, those " Habitually badly affected." Likewise 

 Belmont, Huntsman, and Fameuse may be said to be considerably injured. 

 The next varieties which may be mentioned are Wine, Carolina June, 

 Ortley, and White Winter Pearmain, these being the last four on the list. 

 Although they stand so low, it may be doubted if they are really more 

 susceptible than the Fameuse, for instance, although the latter is much 

 higher in the scale. 



" From a number of the experiments in the preparation of fungicides, 

 the following conclusions may be drawn: 



"1. In the Bordeaux mixture prepared with quick lime a small quantity 

 of copper always remains in solution. This amount often escapes notice, 

 but it may be determined with the aid of electricity. The quantity of lime 

 used affects the amount of copper in solution and when an excess of lime 

 is used only small traces of copper can be recovered. 



"2. The quantity of copper which can remain in solution is consider- 

 ably larger when slaked, or somewhat carbonated, lime is used, and when 

 it is added directly into the solution of the sulphate of copper. When 

 insufficiently slaked lime is used the amount of copper which can remain 

 in solution is sometimes considerable, although the liquid is decidedly 

 alkaline. 



r " 3. The copper is precipitated in the "Bordeaux mixture in the form of 

 the hydrate, basic sulphate, and the double basic sulphate^of copper and 



