Published in Philippine Journal of Science, in 1912, in volume 7, pages 91-95

Published in Philippine Journal of Science, in 1912, in volume 7, issue 4, pages 241-242

Published in Philippine Journal of Science, in 1912, in volume 7, issue 5, pages 295-346

Published in The Philippine journal of science, in 1912, in volume 7D, issue 1, pages 1-64