——, glacial action in, [373].
——, crustaceans of, [376].
——, algæ of, [376].
——, number of plants of, [389].
——, flora of, [399].
Nicotiana, crossed varieties of, [271].
——, certain species very sterile, [257].
Noble, Mr., on fertility of Rhododendron, [252].
Nodules, phosphatic, in azoic rocks, [308].
O.