160 INDEX TO AMERICAN BOTANICAL LITERATURE 
reproductive tissues. Univ. Calif. Publ. Bot. 7: 39-68. pl. 7-10 
'+f.7,2. 9 D 1916. 
Britton, E.G. Notes on Fissidens—l. Difficulties in determining the 
oldest species. Bryologist 19: 87-89. 15 D 1916.  [Illust.] 
Britton, N. L. Echeveria australis. Addisonia 1: pi. go. 30 D 1916. 
Britton, N. L. Opuntia vulgaris. Addisonia 1: pl. 38. 30 D 1916. 
Brooks, S. C. Studies on exosmosis. Am. Jour. Bot. 3: 483-492. f. 
I-4. 23D 1916. 
Brooks, S.C. A study of permeability by the method of tissue tension. 
Am. Jour. Bot. 3: 562-570. f. 1-3. 6Ja 1917. 
Brown, T. W., & Walsingham, F. G. The sycamore fig in Egypt. 
Jour. Heredity 8: 3-12. f. r-6+frontispiece. 27 D 1916. 
Burns, G. P. Studies in tolerance of New England forest trees.—III. 
Discontinuous light in forests. Vermont Agr. Exp. Sta. Bull. 193: 
3-23. pl. 1-5. F 1916. 
Burns, G. P., & Otis, C. H. The trees of Vermont. Vermont Agr. 
Exp. Sta. Bull. 194: 3-244. pl. 1-8. Mr 1916, 
Buttrick, P. L. The red spruce. Identification and characteristics. 
Am. Forest. 22: 705-707. D 1916.  [Illust.] 
Clute, W. N. The blackberry lily. Am. Bot. 22: 81-83. Au 1916. 
{Illust.] 
_ Clute, W. N. Bulbs on stalks. Am. Bot. 22: 130, 131. N 1916. 
{Ilust.] 
[Clute, W. N.] The evolution of herbs. Am. Bot. 22: 124-129. N 
1916. 
Clute, W. N. How plant food is formed. Am. Bot. 22: 122-124. 
N 1916. 
[Clute, W. N.] Note andcomment. Am. Bot. 22: 106-115. Au 1916. 
Among the subjects mentioned are Lignum Nephriticum, Growth periods of the 
elm, Distribution of the oaks, Periodicity in plants, Color forms of Lilium canadense, 
etc: 
Coker, W. C., & Totten, H.R. The trees of North Carolina. 1-106. 
Chapel Hill. 1916. 
Cole, L. A. The Polypody. Am. Fern Jour. 6: 119, 120. D 1916. 
Detjen, L. R. Self-sterility in dewberries and blackberries. N. Caro- 
lina Agr. Exp. Sta. Tech. Bull. 11: 1-37. f. 1-9. O 1916. 
Dubard,M. Les Sapotacées du groupe des Sid linées-Mi 
Ann. Mus. Col. Marseille 23: 1-62. f. I-27. 1918. 
