20 ESS A YS. 



Willdenow from the Berlin garden. It also comprises a por- 

 tion of the herbarium of Pallas, the Siberian plants of Stephen, 

 and a tolerable set of Humboldt's plants. This herbarium is 

 in good preservation, and is kept in perfect order and extreme 

 neatness. As left by Willdenow, the specimens were loose in 

 the covers, into which additional specimens had sometimes 

 been thrown and the labels often mixed, so that much caution 

 is requisite to ascertain which are really authentic for the 

 Wilklenovian species. To prevent farther sources of error, 

 and to secure the collection from injury, it was carefully re- 

 vised by Professor Schlechtendal while under his manage- 

 ment, and the specimens attached by slips of paper to single 

 sheets, and all those that Willdenow had left under one cover, 

 as the same species, are enclosed in a double sheet of neat blue 

 paper. These covers are numbered continuously throughout 

 the herbarium, and the individual sheets or specimens in each 

 are also numbered, so that any plant may be referred to by 

 quoting the number of the cover and that of the sheet to 

 which it is attached. The arrangement of the herbarium is 

 unchanged, and it precisely accords with this author's edition 

 of the " Species Plantarum." Like the general herbarium, it 

 is kept in neat portfolios, the back of which consists of three 

 pieces of broad tape, which, passing through slits near each 

 edge of the covejs, are tied in front : by this arrangement 

 their thickness may be varied at pleasure, which, though of 

 no consequence in a stationary herbarium, is a great conven- 

 ience in a growing collection. The portfolios are placed verti- 

 cally on shelves protected by glass doors, and the contents of 

 each are marked on a slip of paper fastened to the back. 

 The herbaria occupy a suite of small rooms distinct from the 

 working rooms, which are kept perfectly free from dust. 



Another important herbarium at Berlin is that of Pro- 

 fessor Kunth, which is scarcely inferior in extent to the royal 

 collection at Schoneberg, but it is not rich or authentic in the 

 plants of this country. It comprises the most extensive and 

 authentic set of Humboldt's plants, and a considerable number 

 of Michaux's which were received from the younger Richard. 

 As the new " Enumeratio Plantarum " of this industrious 



