562 INDEX TO AMERICAN BOTANICAL LITERATURE 
Britton, E. G. Wild plants needing protection. 2. “Spring Beauty” 
(Claytonia virginica L.). Jour. N. Y. Bot. Gard. 13: 91, 92. pl. 95. 
Jl 1912; 3. “Wild pink’ (Silene caroliniana Walt.). Jour. N. Y. 
Bot. Gard. 13: 109, 110. pl. 97. Au 1912. 
Broadhurst, J. The genus Struthiopteris and its representatives in 
North America—II. Bull. Torrey Club 39: 357-385. pl. 26-29. 
16 Au 1912. 
Includes a key to the petioled species, descriptions and illustrations of Struthi- 
opteris chiriquana, S. Shaferi, and S. vivipara spp. nov., and several new combinations. 
Brown, P. E., & Smith, R. E. Bacterial activities in frozen soils. 
Centralb. Bakt. Zweite Abt. 34: 369-385. 20 Jl 1912. 
Brown, N. E. Cotyledon subrigida. Curt. Bot. Mag. IV. 8: pl. 8445. 
Jl 1912. 
From Mexico. 
Chamberlain, C. J. Eduard Strasburger. Bot. Gaz. 54: 68-72. 10 
Jl 1912. [Illust.] 
Chivers, A. H. Preliminary diagnoses of new species of Chaeto mum. 
Proc. Am. Acad. Sci. 48: 83-88. Jl 1912. 
Nine new species are described. 
Cockerell, T. D. A. Animals and plants described as new from Colorado 
in 1911. Univ. Colorado Stud. 9: 75-89. My 1912. 
A bibliography. 
Copeland, E. B. New or interesting Philippine ferns, VI. Philip. 
Jour. Sci. 7: (Bot.) 53-57. pl. 3-5. Je 1912. 
Copeland, E. B. New Papuan ferns. Philip. Jour. Sci. 7: (Bot.) 67, 
68. Je 1912. 
Copeland, E. B. New Sarawak ferns. Philip. Jour. Sci. 7: (Bot.) 59- 
65. Je 1912. 
Copeland, E. B. The origin and relationships of Taenitis. Philip. 
Jour. Sci. 7: (Bot.) 47-51. pl. 2. Je 1912. 
Cook, O.F. ‘‘Genes’’ not madein Germany. Science II. 36: 115; 
26 Ji 1912. 
Cook, O. F. Physical analogies of biological processes. 
493-498. Au 1912. 
Cook, O. F. Results of cotton experiments in I9II. 
Plant Ind. Circ. 96: 3-21. 17 Jl 1912. a 
Corne, F. E. Another station in central Vermont for Dryopterts Filix- 
mas and for the new hybrid Filix-mas X marginalis. Am. ree 
Jour. 2: 93-95. 3 Au 1912. 
Crabill, C. H. Results of pure culture studies on Phyllosticta 
Sacec. Science II. 36: 155-157. 2 Au 1912. 
116. 
Am, Nat. 46: 
U. S. Dept. Agt: 
pirina 
