|. One year aris 
; by caterpillars drought, &c. An i aback on healt 


























to mana 
“ The disease Mii appears seriously to affect the quality of the Muscovado | 
sugar. Our first cargo of this season, which is just landed in Philadel- 
phia, U.S., shows an average polarization of 85°36 against 89° 4, that 
of our first cargo last year " (22.) 
1l. CAUSES WHICH PREDISPOSE THE CANES TO ATTACK. 
Before considering this, by far the most important question ‘foe. 
nvestigation, it will “be profitable to refer to a very is DE Sy as. 
to whether the Scolytide ever attack healthy plants o 
The buo bon have been y about. either da of this ques- 
tion, and much has been written en 
The 
ones are to b 
of suitable brood-material 
about an exceptional increase in their num 
han inerease may be caused 
ing from forest fires, dama ' storms or snow, oid 
thy trees is 
idit live only in unhealthy trees, and it is when they have i last suc- 
aoe in diminishing the vitality of a tree that they are able to bee 
are any temporary check to the health at a tree, eg planta T 
or partial loss of foliage, from which it would have : 
allow the beetles to establish | MA UR: the net dat ver. ( 
imi i Sut (CORN Plum Tree Shot-Borer. e : 
The : Kylebori differing from most of the > family in ‘boring ^ 
(UU f attacking tl tne in Mer Dal k, a are as a rule less in È 
iuro ü species is couspicuous as a destroyer of standing 
par, Fabr., the Plum-tree Shot-borer, which s 















m, “and on oak trees, &c., it cann ot be doubted that the natural breedir ing 
place of X. dispar = ae ney fallen trees of | larger diameter, ety 
d" ride beeches. ^ 








