Third installment.

51. Deane, Ruthven:

"Unpublished Letters of John James Audubon and Spencer F. Baird," III, The Auk, vol. xxiv, pp. 53-70. Cambridge, 1907.

Fourth installment.

52. Dall, William Healey:

Spencer Fullerton Baird: A Biography. Pp. i-xvi, 1-462. 8vo. 19 illust. Philadelphia and London, 1915.

Reproduces eighteen letters of Audubon to Baird, dating from June 13, 1840, to February 11, 1847.

53. Thayer, John E.:

"Auduboniana," The Auk, vol. xxxiii, pp. 115-118, 4 plates. Cambridge, 1916.

Reproduces four original water-color drawings, and two letters addressed to Dr. George Parkman, dated "New York, June 20th," and "August 13th 1841."