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ifeesidenten von Sumatras Ostkiiste. Ikre mikroskopisehe Skizze befindet 
sich in einer Kopie zum klischieren bei unsereiri Zinkographen 
; zusammcn rnit den anderen fur den Artikel unseres Landesgeologen 
? Professor Potoni^ bestimmten Figurenvorlag«n. Exemplare des Auf- 
satzes iiber das sumatranische Tropenmoor im Vergleich mit den 
Karbonmooren konnen wir Ihnen noch nicht zustellen, da der im 
.Manuscript vollstandig fertig vorliegende Aufsatz erst in Druckgege- 
ben wird, wenn die Klischeeabzuge vorliegen werden. Der Druck 
soli naeh Moglichkeit beschleunigt werden” (msc. 28 April 1909). 
| The microscopical drawing, referred to in the above letter of the 
Kgl. Geol. Landesanstalt, was made by me at Leiden on Oct. 31, 
1908, as the result of a preliminary microscopical examination, which 
I undertook immediately after receiving from India the first specimen 
of peat from the Sumatran “Tropenmoor”, referred tc above. 
This Sumatran tropical peat was collected at my request on June 
29—July 1 1908 by Mr. J. G. Larive, civil officer (Controleur) 
for the division Kamperkiri on the East coast of Sumatra. A copy 
of the log of Mr. J. G. Larive’s journey, which I have received, 
and some data concerning the same district, taken from my 
own log of March 1891, will be presented by me to the Royal 
Dutch Geographical Society of Amsterdam, soon after the publication 
of Prof. Potoni^’s forth-coming memoir. Meanwhile this memoir will 
contain a part of a German translation of Mr. J. G. Larive’s 
log, which translation was prepared by me and was already sent 
to Professor Potonie last year. 
This tropical peat from the fen formations, discovered in 1891 by 
the IJzerman- expedition in Central Sumatra, was collected at my 
request and according to my indications by Mr. J.' G. Larive as the 
result of an invitation addressed to me by Prof. Potonie in June 
1907 at a meeting of the Botanischen Vereins der Provinz Brandenburg 
in Dahlem-Berlin. 
My request was transmitted to Mr. Larive through the much¬ 
valued agency of General G. M. Bleckmann (at that time colonel 
of infantry at Soerabaja). 
As I naturally wish to postpone my detailed coinmuniQation to 
the Royal Dutch Geographical Society until Prof. Potonie will have 
published his investigation of the tropical peat specimens, I limit 
myself here to the above brief remarks. 
Meanwhile I wish to express my hearty thanks to Mr. J. G. Larive, . 
who quite disinterestedly and on behalf of science was good enough 
to undertake the labour of a very difficult journey. In accordance 
with my wish, Mr. Larive collected the specimens personally at the 
