LITERATURE CITED. 65 



XIV. LITERATURE CITED. 



CocKERELL, T. D. A. 1903. The Colorado rubber plant. Bull. Colo. Coll. Mus. 1 : 1. 

 oocKERELL, W. P. 1904. Note on a rubber-producing plant. Science, II, 19: 314. 

 OOOK, (J. F. 1903. Culture of the Central American rubber tree. U. S. Dept. Agr. 



Bureau of Plant Industry Bull. 49. 

 DoDOE, C. R. 1897. Descriptive catalogue of useful fiber plants of the world. U. S. 



Dept. Agr. Fiber Investig. Rept. 9. 

 Ddnstan, W. R. 1910. Editorial in Imp. Inst. Bull. 8: 48. 

 *ox,C. P. 1911. Ohio-grown rubber, crop of 1910. Ohio Nat., 11: 271. 

 — . 1912. Another Ohio-grown rubber, /bid., 12: 469. 

 Hall, H. M., and T. H. Goodspebd. 1919. Rubber-plant survey of Western North 



America. Univ. Calif. Pub., Botany, 7: 159-278. 

 and H. G. Yates. 1915. Stock-poisoning plants of California. Calif. Agr. Exp. 



Sta. BuU. 249. 

 Harbibs, C. 1905. Zur Kenntniss der Kautschukarten. Ber. Deut. Chem. Ges. 38: 



1195-1203. 

 . 1919. Untersuchungen uber den natOrlichen und kunstlichen Kautschukarten. 

 HiLLiER, J. M. 1906. Colorado rubber. Bull. Misc. Inform. Kew, 21&-219. 

 HoAGLAND, D. R. 1915. Organic constituents of Pacific Coast keljM. Joum. Agr. Research 



4:47. 

 Lloyd, F. E. 1911. Guayule. Carnegie Inst. Wash. Pub. 139. 

 Marsh, C. D., A. B. Clawson, J. F. CotrcH, and W. W. EaQLBSTON. 1920. The 



whorled milkweed as a poisonous plant. U. S. Dept. Agr. Bull. 800. 

 Pearson, H. C. 1919. Rubber-producing weeds in Germany. India Rubber World, 



59:201. 



. 1920. Ocotillo again to the front. Ibid., 63: 9. 



RusBY, H. H. 1909. Rubber plants of Mexico. Torreya, 9: 177-184. 

 Saunders, A. T. 1910. Rubber found in milkweed. India Rubber World, 43: 4. 

 Saundebb, Wiluam. 1875. On the manufacture of rubber from a milkweed. Am. 



Pharm. Assoc. Proc, 23:65.5-658. 



