On a piece of chalk <1868>.--The problems of the deep sea <1873>.--On some of the results of the expedition of H. M. S. Challenger <1875>.--Yeast <1871>.--On the formation of coal <1870>.--On the border territory between the animal and the vegetable kingdoms <1876>.--A lobster; or, The study of zoology <1861>.--Biogenesis and abiogenesis <1870>.--Geological contemporaneity and persistent types of life <1862>.--Geological reform <1869>.--Paleontology and the doctrine of evolution <1870>
Microfilm
Includes index