No. 4, January, 1921] PHARMACOGNOSY 287 



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1983. Marsh, C.«Dwight. A new sheep-poisoning plant of the southern states. U. S. 

 Dept. Agric. Dept. Circ. 82: 1-3. 1 fig. 1920. — Daubentonia longifolia. 



1984. Marsh, C. Dwight, and Glenwood, C. Roe. Sweet-clover-seed screenings not 

 injurious to sheep. U. S. Dept. Agric. Dept. Circ. 87: 3-7. 1920. 



1985. Marsh, C. Dwight. The whorled milkweed, a plant poisonous to livestock. U. S. 

 Dept. Agric. Dept. Circ. 101 : 1-2. / fig. 1920. — Asclepias galioides. 



1986. Praeger, W. E. A collection of Sphagnum from the Douglas Lake region, Cheboygan 

 County, Michigan. Michigan Acad. Sci. Ann. Rept. 21 : 237-238. 1919.— The collection of 

 Sphagna was made in order to determine the value of Sphagnum as a surgical dressing. 

 Twenty-six species were found, one of which was first grade dressing material; one was fair, 

 and two were poor but might be used. Samples may be found in the cryptogamic herbarium 

 of the University of Michigan for reference in any future study of the subject. — Bertha E. 

 Thompson. 



1987. Rock, J. F. The poisonous plants of Hawaii. Hawaiian Forester and Agric. 17: 

 59-62. 1920. — Twelve species are given as being internal poisons, of which four are native 

 to the Territory, the remainder being introduced forms. Recognition characters are given 

 in each case. The native plants included are Akia (Wikstroemia spp.), Auhuhu or Hola 

 (Tephrosia piscaloria), Kikania (Solarium spp.), and Kukui, (Aleurites moluccana). The 

 first two of these are employed by the natives to stupefy fish. Both also are poisonous to 

 stock. The introduced plants include common Night Shade, Jimson Weed, Castor Oil 

 Bean, Poinsettia, and Oleander. — Stanley Coulter. 



1988. Rock, J. F. The poisonous plants of Hawaii. Hawaiian Forester and Agric. 17: 

 97-100. 1920. — This concluding portion of Dr. Rock's article includes thirteen additional 

 plants as poisonous. Most of them are introduced, and most of them are easily recognized. — 

 Stanley Coulter. 



1989. Russell, G. A. A machine for trimming camphor trees. U. S. Dept. Agric. Dept. 

 Circ. 78: 3-8. 4 fig- 1920. — Discussion of mechanism for harvesting camphor material, and 

 description of the machine for trimming camphor trees. — L. R. Hesler. 



1990. Scott, W. R. M., and E. J. Petry. Correlation of variation in resin content of 

 Podophylum with certain habitats. Michigan Acad. Sci. Ann. Rept. 21: 225-231. 1919. 



1991. Tommasi, G. Ricerche sull'Henna (Lawsonia inermis L.) Sulla costituzione 

 chimica del Lawsone. [Researches upon Lawsonia inermis L. and upon the constitution of 

 Lawsone.] Gazz. Chim. Ital. 50:263-272. 1920 (Part I).— The powdered leaves of Law- 

 sonia inermis L. from Tripoli, Africa, were extracted with cold water, and the extract was 

 treated with lime water, strongly acidified with HC1, and extracted with ether. Treatment 

 with lime water and strong shaking over ether allow the water layer to assume a strong red- 

 orange coloration. Solution of the product and subsequent additional extraction with 

 ether in strongly acid solution further purify the substance. The compound obtained after 

 numerous extractions and purifications is named by the author "Lawsone." It has a M.P. 

 of 192-195°C, is decomposed at this temperature, and has a M.W. of 174.05, an empirical 

 formula of CioHA), with an elementary composition on analysis of C — 68.95; H — 3.48; 

 O — 27.57 per cent. The structural formula appears to be that of a 2-oxy-l-4-naphthaquinone. 

 It may be used as a dye for wool, silk, and leather. — A. Bonazzi. 



1992. Viehoever, Arno. Commercial hydrastis (goldenseal). Jour. Amer. Pharm. 

 Assoc. 9: 779-784. 1 fig. 1920. — A report on the analyses of a number of samples of hydrastis 

 collected in various states of the U. S. A., giving moisture content, alkaloidal content, total 

 ash and acid insoluble ash content. From the results obtained the author suggests that the 

 required minimum alkaloidal content of hydrastis be raised to 2.75 per cent of ether-soluble 



