July i, 1881.] 
THE TROPICAL AGRICULTURIST 
'37 
turned brown and most spores grey, a few only 
retained orange tinge. 
suits examined and testified by Mr. G. Ross, 
loth January 1881. 
Following I give now in the first instance the 
history, almost up to date, of tht area that had been 
treated early in January last, on Pallekelly and 
Peradenia estates, by the process I havo finally re- 
commended, viz : 
rt of the estate 
a fresh attack 
I wa: 
lield 
red to 
any 
THE VAPORIZATION PROCESS. 
With carbolic acid temporarily absorbed and bound 
by a dry powder'. 
Pallekelly Estate. 
As it was here for the first time, that I tried the 
above process, I selected for the operation as heavily 
a diseased field as I could find, paying particular at- 
tention to obtain for the experiment healthy and 
he; 
vigorous tungus, so as 10 i 
wrong conclusions The field 
The disease was at its height and in the centre were 
about 20 shuck trees in a bare patch, the foliage of 
which was at the time simply one mass of fruiting 
fungus, and which would come under the classification 
of chronically diseased trees. 
Observations made on the 8th day after treatment : 
Out of 104 marked pinspots ' that presented 
every appearance of health and vigour before treat- 
ment, only one spot had thrown out an unhealthy 
looking isolated spore. The rest in nearly every instance 
had turned brownish and appear to be dying off. 
Bright orange spores and spore patches : 30 per cent 
of these have been injuriously affected, the spores 
having lost all colour and patches have blackened. 21 
per cent are fading ; the rest of the spores still 
maintain a bright tinge but patches by blackening 
in most cases. From the genual appearance of the 
field, a decided check of the progress of the disease 
is discernible. Results examined by Messrs. Vollar, 
von Kriegsheiin, and Gibbs and testified by Mr. 
H. J. Vollar. 
14th January 1S81. 
II. 
" At Mr. Schrottky's request, I have gone care- 
fully over the field of coffee treated under his direc- 
tion, a month ago, by vaporization and which had 
two applications. The last was three weeks ago. 
"To what I reported at the time about the result 
of the treatment, I can now add that I see no bad 
results. The coffee is throwing out new wood, which 
looks perfectly healthy, not even the tenderest bud 
having been injured by the vaporisation. The field was 
heavily diseased at the time of application, and cer- 
tainly looks much better now ; though I cannot say 
that the disease has been eradicated. 
" I can see no unusual fall of leaf, and comparing 
it now with the adjoining coffee untreated, its general 
appearance is decidedly better." 
H. J. Vollar. 
5th FebruarV 1881. 
III. 
" From what I have seen of the experiments, 
I fully agree with what has been said (the above) 
bv Mr. vollar." This addition authorized by Mr. 
R. B. Tytlcr. 
IV. 
" I have much pleasure in stating that on disc 
examination of the field that was treated by your 
process of ' vaporization,' some three months ago, 
I (iud that it compares very favourably with the 
adjoining untreated coffee. On the latter, leaf dis- 
easo is again allowing up, while on the treated aiea 
it was difficult to find a leaf diseased." 
M. .1. Vollar. 
!ith April 1881. 
35 
V.—" The field treated in"Jauuary and with a couple 
of subsequent applications has kept remarkably free 
from disease. With the exception of one tree, now 
badly diseased, the iield is almost entirely free of 
disease. The shuck trees that were in January full 
of disease have been keeping and are still without 
disease." 
H. J. Vollar. 
31st May 1881. 
Peradeniya Estate. 
Here as well I selected fields that suffered from 
the disease in a pronouueeed and vigorous form, and 
I rejected several fields proposed by Mr. G. Ross, as 
I did not consider them, sufficiently diseased to en- 
able us to judge correctly of the results. In fact, 
we had some difficulty here in finding a field sufficiently 
diseased for the purpose. 
I. 
A four acre field first inoculated, then vaporized, 
in the usual way. 
Observations made on healthy pin-spots and brig h 
orange-coloured spore-patches : — Not a single pin-spot 
fruited. The spore-patche-t had almost al died. Tho 
patch had turned brown and the orange spores grey 
A few only still showed a faint orange tint. 
A one acre field ; only vaporized but with three 
applications within ten days, one of unusual strength. 
Results much the same as above. No pin-spots ha i 
fruited, and spore-patches nearly all died. "I [Mr. 
G. Ross] am of opinion that the disease has been 
checked on the treated area, and this opinion is 
strengthened by comparing it with untreated coffee 
elsewhere on the estate " 
Results examined and testified by 
15th January 1881. G. Ross. 
II. 
II.—" I have carefully watched Iha four acres of coffee 
on this estate which were treated by both inoculation 
and vaporization accordiug to .Mr. Schrottky's system, 
and under his direction. In addition to what 1 
reported at the time the resulis were examined, I 
now state that as far as I can see no injury what- 
ever has been done to the coffee on this area. Nor 
is leaf disease present to any appreciable extent. The 
attack, however, is apparently pacing away all over 
"The one acre referred to by Mr. Mackenzie situated 
some distance from the lield referred above, received 
an overdose. This was doue at Mr. Schrottky's request 
with a view of gaining experience of how far the 
chemical could be used with safety to the trees. A 
very heavy dose (applied through Week's patent sul- 
phurator) and two doses of usual strength (a hand- 
ful to a tree) applied all within ten days were followed 
by a fall of leaf greater in the so-treated area than 
in the surrounding untreated coffee. I think the 
damage is confined to this, as the trees are now making 
new wood. 
" On the margin of this patch, there were at the 
time of treatment, some trees very heavily laden with 
Rust, and Mr. SchroUky remarked that he did not 
expect much impression could be made on these. It 
was from one of them that Mr. Mackenzie carried 
iiwav the braueh which he sent to Colombo." 
7th Fehruarv 1881. G. R.ss. 
III. 
The management of this estate changed and the ueit 
manager writes : — " In reply to your request to re- 
port on the coffee, on which you experinu nted, lean 
only state, that it is certainly looking verj well and 
dees not appear to have suffered at all from the ap- 
