Unidad documental simple 95 - Letter from John William Lubbock

29 Eaton Place - Mr Hopkins' [William Hopkins] paper on cracks in the crust of the Earth's surface is a big disappointment: 'With respect to the hypothesis of a crust, in contact with an interior fluid it appears to me a state of things which could not subsist. Unless they be in contact and continue so, the fluid would exert no pressure against the crust. If they were once in contact the slightest irregularity in their expansibilities by heat would make this condition cease, and the higher tides, which would never amount to above a few feet, would never reach the crust'. JWL hopes WW will write something upon the tides as a whole.