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limbs of' Venns are generally so ill defined that there is no question 

 of making microscopic measurements. Dr. P. J. Kaiser, assisted by 

 Mr. M. B. RosT van Tonningen, has done everything in his power 

 to succeed, but specially in making photographic observations we 

 are powerless against atmospheric conditions. 



I cannot finish this paper without expressing our tlianks to the 

 Dutch and Dutch East Indian Government, who have assisted the 

 expedition to Reunion as much as they could, also to the Teyler 

 Society, the "Hollandsche Maatschappij der Wetenschappen", both 

 at Haarlem, to the "Bataafsch Genootschap" at Rotterdam and to 

 Mr. DE Beaufort, who contributed efïiciently (the Teyler Society and 

 Mr. DE Beaufort by lending the photo-heliograph and a telescope) to 

 procure the necessary means to the expedition. We have also cordially 

 to thank the Governor of Reunion, (Mr. de Lormel) ^), the Maire 

 of St. Denis, (Med. Dr. Le Siner), the director of the "Banque de 

 la Reunion", (Mr. Bridet), who often assisted and advised us, and 

 further several other inhabitants of St. Denis, who opened their 

 houses to us. Among these I mention Messrs. Bertho, Hugot, de 

 TouRis and Pezzani. In Mr. Chailliey, watchmaker, we fortunately 

 found a clever instrumentmaker, who several times made the necessary 

 reparations to our instruments. 



I must also mention that Mr. Soeters (engineer of the Geographical 

 service at Java) during the passage from Batavia via Aden to Reunion 

 suffered already from the first attacks of a liver-complaint, which 

 a few years later, April 10^*^ 1879 carried him to his grave. At 

 St. Denis he was sometimes for several days unable to assist me at 

 the heliometer, then Mr. Bakhuyzen obligingly took his place. On 

 these occasions he was looked after with the greatest care by the 

 military surgeon Mr. Muircec. 



Lastly I mention the valuable assistance in several respects given 

 by the "amanuensis" of the expedition Mr. T. F. Blanken. 



1) Scarcely had we cast anchor in the harbour of St. Denis, when the harbour- 

 master arrived in a boat to offer us in the name of the Government his assistance 

 to carry ashore the passengers, the luggage and the instruments, 



Proceedings Royal Acad. Amsterdam. Vol. Vill. 



