272 UNCLASSIFIED PUBLICATIONS [Bot. Absts., Vol. IV, 



1821. Leadbeater, J. W. Decolorizing carbon. Jour. Amer. Peat. Soc. 12:222. 1919. 

 — British patent 122698 (Jan. 31, 1918) covers a method of preparing decolorized carbon from 

 peat. — G. B. Rigg. 



1822. MacMurray, Nell. Elder blossoms. Amer. Bot. 25:66. 1919. 



1823. Marie-Victorin, Fr. des E. C. Toxicite de la prele des champs. [Toxicity of 

 field horsetail (Equisetum arvense L).] Naturaliste Canadien 46: 148-151. Jan., 1920. — The 

 author presents evidence to show that Equisetum arvense L., together with E. sylvaticum L., 

 E. fiuviatile L. and E. hyemale L., have proved poisonous to horses, especially on the low 

 clay banks of the St. Lawrence river. About May, 1919, five horses showed symptoms of cere- 

 bro-spinal meningitis apparently due to horse-tail poisoning. He gives descriptions of 

 symptoms by Friedberger and Frohner, and by Prof. Jones and Dr. Rich. Young horses 

 succumb more readily than old ones and those fed on grain show greater resistance than 

 others. The old, dry plants eaten with hay are especially toxic. The symptoms are de- 

 scribed as equisctosis. [See also Bot. Absts. 4, Entry 1840.] — A. H. Mac Kay. 



1824. Mattle, P. A. The Swiss mountain pine. Nat. Study Rev. 15: 1-5. 1919.— 

 Description of scenery. 



1825. Nageotte, J. Organic matter and life. Sci. Amer. Supplem. 87:362-363. 1919. 

 [Translated for the Scientific American Supplement; source not stated.] 



1826. Ott, E. Gas from peat. Jour. Amer. Peat Soc. 12: 210-211. 1919.— Owing to 

 their comparatively high oxygen content and low carbon content, wood and peat, when sub- 

 jected to destructive distillation, yield a gas containing a high proportion of carbon dioxide 

 and consequently a low calorific value. The tars yielded by these substances are hygroscopic. 

 — G. B. Rigg. 



1827. Pammel, L. H. The whorled milkweed. Amer. Jour. Vet. Med. 14: 135-136. 1919. 

 — Two letters are quoted giving details of a case of sheep poisoning in Colorado by the 

 whorled milkweed, identified by the author as Asclepias verticillata. The letters state that 

 potassium permanganate, given hypodermically, was used as a remedy. The remainder of 

 the article is material from Colorado Agric. Exp. Station Bull. 246. [See also next following 

 Entry, 1828.]— C. D. Marsh. 



1828. Pammel, L. H. Whorled milkweed. Amer. Jour. Vet. Med. 14:514. 1919.— 

 After a note on the newspaper reports of whorled milkweed as a poison to stock in Colorado, a 

 list is given of Iowa localities for Asclepias verticillata. The plant is found at Minneapolis 

 and St. Paul, LaCrosse (Wisconsin), and Yankton (South Dakota), as well as in Colorado. 

 [See also next preceding Entry, 1827.] — C. D. Marsh. 



1829. Pammel, L. H. Frozen beet tops. Amer. Jour. Vet. Med. 14:244. 1919.— Three 

 horses died, presumably from eating frozen sugar-beet tops. A short description of the symp- 

 toms is given. — C. D. Marsh. 



1830. Pammel, L. H. Supposed poisoning from cowbane. Amer. Jour. Vet. Med. 14: 456. 

 1919. — A weed sent from Colorado is identified as either Cicuta macvlata or C. occidentalis. 

 The author states that he has fed Cicuta roots to horses in summer without injury, but that 

 these roots produce fatalities in the fall or winter. It is supposed that injurious results 

 from feeding this plant are caused by the fresh leaves. Many persons have been poisoned by 

 contact with the plant when perspiring. [See also Bot. Absts. 4, Entry 1834.] — C. D. Marsh. 



1831. Pammel, L. H. Fly amanita and boleti. Amer. Jour. Vet. Med. 14:514. 1919.— 

 Large numbers of specimens of Boletus were seen at an altitude of 11,000 ft. in Colorado. In 

 the same region the fly amanita was numerous and it is suggested that the latter may cause 

 some poisoning of sheep in that region. A description of the fly amanita (A. muscaria) 

 follows. — C. D. Marsh. 



