VI r.loClJAI'llKAl. SKKTCII OF 



J()Ii;nni llolu'iiackci-, tlicii ciiiiniicd in llic |nil»Ii(';il idii of llic 

 |tl;iiils collctit'd hv liiia iu .Vsiuii- Knssia nud til" a li"i!'.iiiiini 

 of iiicdiciiial plants. 



Din-in,:;' the snimiicr vacation ol JSiT) yoHiijLi .Molir was cin- 

 pldvcd in arranjiini;' the dnplicatc* specimens of the Polytech- 

 nic School, accnnuilated dnrini>' many years, and in distrihut- 

 inii; tliem amon^' llie Real >iclnilc of tlie land. In this work he 

 made the acMpiaintance of Ani;nst Kajjplei- wh(> for many years 

 had heen en^a^^cd in the collection of natural history sjx'ci- 

 mens in Dutch (Juiaua. Alohr's application to accompany him 

 on his next voyage as a collector especially of botanical speci- 

 mens, met with* favor, and when his work in the arrangement 

 of the cabinet of the Polytechnic School was ended, he remain- 

 ed some weeks with Hohenacker, applj'iug himself diligently 

 to preparation for the proposed voyage. Hohenacker also un- 

 dertook to publish the botanical collections which were to be 

 made in Surinam. 



In ]S\)vember, 1845, with Kappler, young ^lohr left Stutt- 

 gart for Amsterdam, where they took passage in the bark Na- 

 talie, reaching- the coast of Guiana towards the middle of 

 March, 1846. At that time a \Qvy severe drouth was prevail- 

 ing, which made possible the collection of many interesting 

 plant forms occurring in the swamps and marshes about Par- 

 amaribo. An expedition was made to the upper waters of the 

 Surinam, in order to make before the rain}' season a collection 

 of living plants for the Belgian trade. On account of the dry 

 weather this expedition did not prove very successful in the 

 collection of insects and of herbarium specimens, but was 

 more satisfactory as regarded the living plants. A few days 

 after his return to Paramaribo from this expedition, Mohr 

 was attacked with bilious fever which kept him confined to his 

 hammock for several weeks. During the rainy season, which 

 soon set in, nothing was done in the way of collecting, but the 

 time was employed in preparations for the long excursion to 

 the Maroni River and in writing up notes and in correspond- 

 ence. At the end of the rainy season the expedition was made 

 up the Maroni liiver to the borders of Cayenne, where the 

 party encamped and a])])lied themselves with great industry to 

 the collections for which they had come. 



]Most of them were attacked by fever and dysentery, from 

 which they ra])idly recovered, but it Avas otherwise with young 

 l^Iohr, who was kept confined to his hammock for many weeks, 

 losing all this time from his work of collecting, to his great 

 disappointment and grief. 



