138 THE NEW HORTICULTURE. 



3. Weakly growing trees escape, while the vigorous and 

 strong are often attacked and killed alongside. This is con- 

 trary to general experience and all analogy in resisting 

 disease. 



4. The attacks are often sporadic, some bearing and some 

 young trees near by being affected, while others escape. 



5. Trees whose limbs and leaves were coated continu- 

 ously with sulphate of copper, the best known germicide, 

 from spring till fall, blighted just as badly as those not 

 treated. 



6. Continued cutting out has no preventive effect, nor 

 does it cause apparently healthy shoots on blighting trees, or 

 those near by that are cut back, to become diseased at the 

 cut ends, where sap is exposed to external attack. 



7. Blight was never known in Galveston county during 

 thirty years of pear culture until it appeared in my twelve- 

 year old orchard in 1894. How did it happen that the bac- 

 teria, when borne on the breeze or by insects, if thus brought 

 from the interior blighting districts of the state, passed 

 through all the pear orchards, many of them in bearing, at 

 Alvin and Arcadia, without stopping, and settled in my 

 orchard, within a few miles of the Gulf of Mexico, and fur- 

 thest removed from the point of infection? 



8. A careful inquiry showed that the growing season pre- 

 ceding a bad blighting one was always dry everywhere, thus 

 checking normal growth and forcing a long period of un- 

 natural rest, and that heavily loaded trees, having rested 

 most completely, were most susceptible to premature motion 

 of the sap during warm weather in the following winter. 



9. A bad blighting season is invariably preceded by a 

 late winter or early spring freeze which is preceded by 

 unseasonably warm weather. 



10. California, with its equable winter climate, and irriga- 

 tion to keep up continuous motion of the sap during the 

 growing season, has little or no blight. 



11. While it has been claimed that healthy pear trees 



