Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 2-3

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 13-16

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 17-20

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 23-24

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 25-38

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 46-48

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 52-56

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 65-68

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 68-71

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 71-75

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 88-90

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 105-110

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 116

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 117-119

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 123-126

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 134-135

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1841, in volume 1, pages 137-138