326 



conclusion of their local creation in their present habitats. The 

 relations of Parasites afford considerable proofs against the 

 hypothesis that the differences of terrestrial conditions have 

 caused the differences in animals. We could not suppose that 

 the lice living on European birds would be different from those 

 of the analogous species of American birds, if they arose from a 

 common stock ; their parasites ought to agree as to species. 

 This is not the fact ; not only do the parasites of our animals, 

 compared with analogous species in Europe, present differences 

 greater than those of the animals on which they live, but even 

 our species of birds or mammals, having no representative on 

 the other continent, have their own parasites as distinct as them- 

 selves. Those animals, which by their own powers of locomo- 

 tion or by human means are common to both continents, have 

 parasites identical in character, as far as Dr. Burnett's observation 

 goes ; the lice of our cow, horse, or hog, do not differ from those 

 of the same animals in Europe ; the same is true of some birds. 



Dr. Burnett thinks the legitimate inference from these facts is, 

 that the analogous species of animals of the different continents 

 were created as such, and therefore have their proper parasites, 

 and did not emanate from a common stock. 



The lice of the Quadrumana, or Monkeys, seem to be quite 

 different from those of man ; in fact the species of man are not 

 found on the monkeys, except when their presence may be 

 accounted for by accident ; those of the monkeys are found only 

 on them. 



Dr. C. T. Jackson announced, that at Franklin, N. J. 

 he had discovered in Labrador Felspar, small black crys- 

 tals of Allanite containing the protoxide of Cereum, as con- 

 tained in the Swedish ores. «• 



A committee, consisting of Dr. C. T. Jackson, Dr. N. B. 

 ShurtlefF, and Dr. S. Cabot, Jr., was appointed to memori- 

 alize Congress on the subject of attaching a corps of Natur- 

 alists to the Mexican Boundary Commission. 



Dr. Cabot announced the donation of Rallus crepitans 

 and Tringoides macularia (young) from Theodore Lyman, 

 Esq. ; this is the first time, to his knowledge, that the Ral- 

 lus crepitans has been taken in Massachusetts. 



