22 



slice taken through the tuber or bulb with the stem and leaves 

 attached — this reduces thickness, and the outer coats or skin of 

 the parts cut away should also be preserved. Thick leaves like 

 those of Agave and Aloe should have a few thin transverse 

 sections made at the base and middle, then a leaf should be laid 

 with its upper surface downwards, and the under skin and all the 

 pulp of the leaf removed, leaving only the upper surface of the 

 leaf ; care should be taken that the margin and any prickles upon 

 it remain intact ; the sections and upper surface of the leaf are all 

 that it is necessary to preserve. If the leaf is over 16 in. long it 

 may be cut into 16 in. lengths and the pieces numbered in ink, so 

 that it may be reconstructed when dry. Succulents prepared in 

 this way dry better and much more quickly than if unprep ired. 

 Seaweeds should be slightly washed in fresh water, and the 

 delicate kinds should be floated out upon sheets of white paper 

 before they are subjected to pressure. 



The pile composing the press should not be too thick, it is 

 better to have two or three thin presses than one very thick one. 

 Plants that are partly dried should be kept separated from those 

 freshly placed in the press by the intervention of another frame 

 or other means. When the specimens are perfectly dry, remove 

 them from the press, place upon sheets of paper (newspaper will 

 do) with their labels, tie up in bundles and keep in a perfectly dry 

 place. In order to prevent the destruction of the specimens by 

 insects it is advisable to sprinkle powdered naphthalene between 

 the sheets of each bundle in some quantity. For transmission 

 the bundles should be tightly wrapped in oiled cloth. 



Collectors in Nigeria. 



In the following list are given the names of the collectors who 

 have contributed specimens from Nigeria, either to the Royal 

 Gardens, Kew, or to the British Museum. Although the period 

 covered is from the early part of the XlXth Century to the 

 present time the list is by no means a long one. 



Any genera named in honour of these collectors are also given 

 in brackets under the names. 



Mungo Park, A.L.S. (Travelled in Africa, 1795-7, 1801-5) ; 

 died on the Niger, 1805. [Parkia, R. Br.] 



Captain Hugh Clapperton, R.N. (1822-1824) died April 13, 

 1827, buried at Jungeri, Sokoto province ; was the first 

 European to visit Sokoto, March 16, 1821. \_Clapper- 

 tonia. Meisn.= Ho?icJcenya, Willd.] 



Lieut.-Col. Dixon Denham (1822-1824), died, Sierra Leone, 

 May 8, 1828. [Denhamia, Schoti = Culcasia, R.Br.] 



Walter Oudney, M.D. (1821-24) collected in Bornu ; died 

 at Murmur, W. Sudan, January 12, 1884. [Oudney a, 

 R. Br.] 



Dr. Theodore Vogel (1841) collected chiefly near Lokoja. 



John Ansell (1841) collected with Dr. Vogel on the Niger 

 Expedition. [Ansellia, Lindl.] 



Edward Vogel (1851-55) collected in Bornu. 



