en preferring Specimens of Plants. 23 



inftruclions, are praclifed in the ufual methods of prelcrving dry 

 fpecimens, and that they are aware that particular care fliould be 

 taken to pare off the back parts of thick woody ftalks, and of the 

 globofe, fucculent heads of flowers, as well as of the buds of thofe 

 intended to be pafted down, previous to their preflure. For the 

 moft fa tisfactory information on thefe particulars, the reader is re- 

 ferred to the Introduction to Dr. Withering's excellent work above- 

 mentioned. It is almoft needlefs to mention, that aluminated fpe- 

 cimens will be completely guarded firom the erofion of infects, as 

 well as from the danger of being injured by damps ; and therefore 

 the procefs will be particularly valuable to thofe who vifit foreign 

 countries. 



As beauty and durability are of fo much confequence in the ar- 

 rangement of an herbarium, and as plants cannot be preferred any 

 length of time in perfection even with the ufual apparatus of a vaf- 

 ciilum^ or tin-cafe, no botanical traveller fliould be without a fmall 

 prefs, fuch as that defcribcd in Dr. Withering'* .drrangement, v. i. 

 /. 31. It may be framed fo as to admit of a drauer for receiving 

 the preferved fpecimens ; either thin enough to lie under the feet 

 in a poft-chaife; or, as a feat for a third perfon is often deGrable, it 

 may be contrived to be as high as the feat of the carriage, with a 

 correfponding culhion on the top. 



v'. O', 



