PATHOLOGY. 55' 



a similar instance was seen by the author on Pinus Coulteri at The 

 Frythe, near Welwyn. These out-growths, frequently called " burrs," 

 are sometimes the result of injury by mites or other insects. In the 

 branch from Buckinghamshire the fasciation took a circular form of 

 about nine inches in diameter, and presented the appearance, on 

 superficial view, of a cushion of the common garden Thrift, Armeria 

 maritima. 



Fig. 40. "Burr" on a Scots Pine. (From the Gardeners' Chronicle.) 



PATHOLOGY. 



THE DISEASES OF CONIFEKS.* 

 BY PROFESSOR MARSHALL WARD, D.Sc., F.R.S., F.L.S. 



SPEAKING broadly, there are two great classes of diseases which 

 imperil the life of Conifers. There are, on the one hand, diseases 

 due to the more or less directly injurious action of other living 

 organisms animals and plants which injure or destroy the roots, 



* Reprinted from the Report of the Conifer Conference held at Chiswick, October 7th 

 and 8th, 1891, by permission of the Council of the Royal Horticultural Society. 



