Ixxxil INTRODUCTION. 
give a connected, though imperfect, view of that particular 
part of the country, and people visited by the expedition. 
The papers, No. 2 and 3 in the Appendix, by Doctor 
Leach, and Sir Everard Home, respecting the parasitic 
Vermis which takes possession of the Argonaut shell, and 
which clear up a long disputed point in natural history, 
are reprinted from the Philosophical Transactions, by 
permission of the venerable President, who is on all occa- 
sions most ready to lend his cordial assistance to the dis- 
semination of human knowledge. 
The other papers in the Appendix, illustrative of those 
subjects in the animal, vegetable, and mineral kingdoms 
which occurred along the line of the Zaire, as far, at least, 
as. the materials sent home would admit, were obligingly 
drawn up by Doctor Leach and Mr. Koenig of the British 
Museum, and by Mr. Brown, Secretary to the Linnean 
Society, and Librarian to Sir Joseph Banks; to each and 
all of whom, but more especially to the last mentioned 
gentleman, for his excellent observations on the plants 
found in the vicinity of the Congo river, the Editor has 
to express his grateful acknowledgments, 
