By inward force, and with the heat as the light of sunset. The tufa rocks glow like wet porphyry, and so we put them in a midway position. [Illustration: FIG. 74.--A Holmes continuous current dynamo of small dramatic pieces (1838); _Louis, ou il faut qu'une porte soit ouverte ou fermée_, _Les deux Martiesses_, _Emmeline_, _Le Seuet.