41 
of expressing my most hearty thanks to all those who have 
assisted in any way in the foundation of the Batavia Obser- 
vatory; — to. the Royal Academy of Sciences of Amsterdam, 
who so effectually supported von HunsoLpr’s suggestion ; — 
to Professor Buys Barror, the Director of the Royal Dutch 
Meteorological Institute of Utrecht, who first made a detailed 
plan to give execution to it; — to the Kew Committee and 
to the Staff of the Kew Observatory, at which Institution 
I found ample opportunity for studying terrestrial magnetisin 
and meteorology; — but above all to General Sir Epuarp 
SapINE, who did all he could to promote my object, and who 
placed with the utmost kindness his great experience in 
magnetical research at my disposal. 
On account of the great delay, which by unforeseen cir- 
cumstances the building of the Batavia Observatory experien- 
ced, I have been unable to fulfil entirely the expectations of 
those who so kindly lent me their assistance when I was 
preparing for my undertaking. But the principal object, 
for which I went to India, has been attained. The work 
done at the temporary observatory, however little it may 
be, has, I flatter myself, afforded ample proof for the great 
services, Which magnetical and meteorological observations in 
this country may render to Science, and for the future, the 
study of terrestrial magnetism and meteorology in the East 
Indian Archipelago has been founded on a solid basis by the 
erection. of a Central Observatory at Batavia, provided with 
the best instruments now required by Science" (1). 
Dit derde deel bevatte uurwaarnemingen, enkel van de 
jaren 1874 en 1875, maar bovendien eene grondige bewerking 
van al de waarnemingen gedurende de 10 jaren 1866— 
1875. 
(1) Het zal voorzeker vele lezers van dit levensbericht aangenaam zijn, 
deze voorrede in haar geheel te lezen, daarom is zij hierachter in Bijlage С 
. medegedeeld. 
