...study them is wholly apart from theoretical researches as to the original formation of rocks, etc., and is confined to such facts as are open to every-day...observation, and of the existence of which no doubt can be raised. In the selection of examples also, care has been taken to embrace such prominent features...

...which is required to study these models is wholly apart from the theoretical researches which extend to the original formation of rocks, and is confined...facts as are open to every-day observation, and of which no doubt can possibly exist. The description of the models can be had separate, price 1». 6rf....