July 1, 1902.] THE TROPICAL AGRICULTURIST. 
be previously immersed in water for a few iniimtes 
so as to disintegrate them. Tlie bitter taste of 
suspended or dissolved quinine can be corrected by 
taking one cr two moutlifuls of food immediately 
after the medicine. Just before meals, especially be- 
fore breakfast, is the best time for quinine, and its 
presence in the blood should be announced by a 
ringing; in the ears within half an hour. Details 
of the doses needed in malarial fever are given — for 
a first attaclc 10 gr. of quinine should be given 
about every twelve hours for a week, wliicli may 
be increased to 15 or 20 gr. In cases of vomit- 
ing it may be necessary to reduce the dose, and 
in is often useful to administer a saline purga- 
tive with the first dose of quinine. If a person 
has once become infected with malarial fever, he 
must continue to take quinine regularly for at least 
three or four montiis, so as to ensure extermina- 
tion of the parasites, otherwise relapses are sure 
to occur,— Chemist and Drugrjist, May 17. 
TROUT OVA. 
It will be interesting to our readers to 
learn that of the first consignment of 20,000 
brown trout ova, wliich arrived a few months 
ago from the Wyresdale hatcheries about 
12,000 were hatched out successfully. At a 
Committee meeting of the Fishing Club re- 
cently held, it was decided to distribute the 
fry out to the different streams as follows— 
and which has since been done : — 
Belihul Oya ... ... 500 
Ambewella ... ... 1,000 
Horton Plains ... ... 3,000 
Nuwara Eliya Streams ... 1,500 
Barrack Plains ... ... 300 
Maskeliya.. ... ... 500 
Mr. R Jackson, for Sita Eliya ... 200 
The other fry are at present in the stew 
pond. Of the first consignment of 20,000 
rainbow troucova from the Earl of Denbigh's 
hatclieries only 2,500 are reported to have 
hatched out and within the last fortnight 
these have begun to die to the extent of 40 
to .50 a day. Of the second consignment of 
20,000 rainbow ova also from the Earl of 
Denbigh's hatcheries 50 fry only hatched 
out. There were also 5,000 brown trout ova 
sent out as a present. Of these only 20O are 
said to have hatched. The fry of this con- 
signment and also that of the first consio-n- 
meut of brown trout ova are also dyfng 
daily but in smaller numbers.— Coa 
VACCINATING OYSTER TO PRODUCE 
PEARLS, 
Pearls are found to be due to the presence of a 
larva, which is an intestinal parasite of the eider 
duck, and has also been found in the scoter or 
black duck. The larva, parasitic in the mussel, is 
found to arise as a tailless creature, which enters 
the tissues under the skin of the mussel, and be- 
comes surrounded with a sac similar in character 
to the outer shell-secreting skin of the mantle If 
the intruder <Ues in the sac, it, becomes calcified 
and forms the nucleus of a pearl, the pearl arisino-, 
like the shell itself, from the line of the cell wall 
The parasite sometiniws migrates out of the sac, in 
which case the nucleus of the pearl is inconspicuous. 
The complicated life-history of the parasite 
and absence of organs of locomotion snince. in the 
opunon o the British MedicalJoavnal, to'aceo, t 
for the hitherto uiexplicable disfibuti, n of pear 
beanug .nussels. By experin.ent it has been ound 
tha pearls .are caused by si.nilar parasites in .«orne 
otthe pearl oysters ; audit is believed that ar ! 
ficial uifection of pearl oysters could be ellect^d in 
a manner similar to that which has been found 
sueces..f„l in the case of the common mussd - 
Bombay Gazette, June 3. ■"ussei,- 
SOUTH AMERICAN RUBBER INTEREST 
(From India Rubier World, May 1 i 
Arrivals of rubber at Manaos during tl e fir.t 
t uee months of 1902, from the different" i v«r. fn 
the state of Amazonas, were as foHows '° 
Jarua - ^'^"^ f,42*,837 
Solimoes 1,840,747 
Madeira . "' , 729,448 
Various streams fi%S 
T..f„i ^''i^os 8,244 803 
Tota , same months, 1901 ... 6 99198c 
Total, same months, 1900 7 770 qs* 
A correspondent at Manaos wrote' reeen lv thaf 
many persons there were hoping for a„ « Jv« 
in prices, and were for that reason holdint back 
rubber. Business was depressed and fh^^ic 
houses were not disposed to sell goods i t''^^ 
strictly cash terms. The inspec to. of tl If 
Colonel Felippe Minhos, and Dr Porti. io^n '"''y' 
secretary to the -overnor Lrl ^o«"eno. 
United States to ^tr^' "« 'ne^o iatf 1 '° 
11,000,000, in return for whLlfi u!. . 
the lender would have very des'i abl 
■m respect to export duties L'Tubb, . TuTT, 
^fZi\^^°^s./duirofrfoTt.i^^4-^^- 
kilo for the existing Lz IX^.^'^lTe "ol'l^^ 
The South American Journal (London A m il 
12) contained advices from Para, sSg'- - i 
most important move in the rubber hn^;.;" • 
about to be made by a Peruvian imm^S '^'''-''' 
who arrived here a few c ays «.o from Cf' 
bringing with him 70 workmen who nndll/ '^' 
working Caucho." The idea appea s to t hat 
on account of the exhaustion of' exten ive Caucho 
fields in Peru, increased attention is bebg I "Jn 
to Caucho in Brazil, where the preparat on of H.^ 
gum is not understood, while the Pern vL! ^ 
expert in it. It is repo.' ted to be probable that on 
the Tocantina and other lar-e rivers ^n fhi f ° 
of Para "large quantities "oVcauelo 11^'^ 
eund, and now that a commencement is about ^o 
be made, the result will probablv he nn it 
fewyean.^" ^"^ P-'^"--" of i/aucLTn'tl'^TJ^t 
ESSENTIAL OILS 
OF INTEREST TO CEYLON. 
New York.-April 1902.) ^"P^'^' ^"^^"'^ 
CAMPHOR OIL. 
