TW|i;-<;.VLLS OF THK AI.KlTo PINK. 



Twig-galls of the Aleppo Pine. 1 



The -jails occurring on the twi-s and bram-h-- \ /' 

 t t ii*i are even larger than those mi tin- olive; th 

 particularly common iu the woods near ( in tin- Maritime 



Alps. The galls cniitain masses of bacteria situated in canaN 

 ami cavities in the parenchyma. and throughout the woodv 

 tissues inside the galls. Prillieux re-anU bacteria as the cause 

 if the galls, and In- believes that they penetrate the healthy 

 bark and form nests which kill the parenchyma. Kxpenmcntal 

 infection has, however, not yet been carried out. 



Canker of the Ash. 



Soraiier- regards tin- well-known ash-canker as the iv-ult 

 of the action of bacteria, but Xoack thinks this improbable. 

 were found in the canker-spot^ only in -uninier. ; uid 

 t easily have got there accidentally alter the formation o| 

 -all-. Calls of the ash caii-ed by attacks of the 

 Phytoptus may tVe.iuently contain bacteria. 



Canker of the Ivy. 



Lindau :: describes a cancerous fonnation mi i\-y-twi--. 

 ]i;ini-'d b\- death of portions of the leaves. The di-ea-ed pi 

 contained slimy ma-se.- of bacteria, and the cank'T-^pts. thoii-h 

 at first isolated by formation of wound-cork, continued to extend 

 till they reached the wood, which was ultimately killed. Pure- 



culture and infection-experiments were not -Mined out. and the 



author himself was unable to determine \\heiher the ha'-teiia 

 were primarv agents in the canker- formation or only late arri\ 



Lilac Disease. 



r 1 iibsei'Ved masses of bacteria melo-.-d m cavities in 



i^ t wi^s of lilac which after beeomiii 1 .; bla-'k--poi ted had 



in many cases broken over. The attack ami the part tak- n in 



it b the bacteria Weiv not howe\.-r in\ i--i i-.ited fuitln-i. 



' Vmll. '111111, "Sm- mi.- tunii-ur da I'm 'I' \lr|>. ' Compi . evil., 



i'llllli-IIX it'"'. //.). 



muer, .1"'"- /. /'//<// nLnniLI" >' \ N.M. k, " I < I ben I 

 Pfla 1893, p. I!'::- 



l.nnhiii, /('- h.'il! I /'//./,, ... Is'M, p. I. 



'Soraner, / i'^lii-(n /. Pfia . 1891 \< 1^-, uul ! - 



