122 EEPORT OF IS^ATIOKAL MUSEUM, 1920. 



etc., AViis made and contributed by Mr. Charles A. Myers. Ji., of tliL* 

 Dodo-e and Olcott Company. A model of a peppermint stili. to show 

 the ty})e of still most used in obtaining tlie essential oil from le^ives 

 and herbs, was constructed in the laborator^v of the division of tex- 

 tiles, from plans furnished hj the A. M, Todd Company of Kuij- 

 mazoo, Michigan. Another model, that of a birch oil still, was <Ie- 

 scribed in last j^ear's report. 



Much material for an attractive exhibit of materia medica deii\i' 1 

 from the mineral kingdom was obtained during the year. In medi- 

 cine these substances are called '* chemicals "' in contradistinction to 

 '• galenicals,'- which are medicinal substances approved of by Galen, 

 a cele'Drated Crreek physician and medical writer of the second c^^n- 

 tury. who opposed the use of chemical drugs. The exhibit shows 

 samples of the ores which are the principal sources of these medi- 

 cines, photographs of the mining of each element represented, and 

 specimens of the official medicinal substances. Several firms con- 

 tributed to the completion of this exhibit as follows: The Powers- 

 Wei ghtman-Eosengarten Comx)anv of Philadelphia, .59 specimens 

 of inorganic chemicals: E. E. Squibb and Sons, New York City, 51 

 sjX'cimens of medicinal chemicals; photographs showing mining of 

 tlie original ores were received by transfer from the U. S. Geological 

 Survey, and by gift from Dr. Thomas L. AVatson, State Geologist, 

 Charlottesville, Virginia. 



A corresponding exhibit, illustrating the animal sourcM?s of medi- 

 cines, also received some additions during the year. Help toward 

 this enil was given by the contribution of specimens or photographs 

 as follows : 



Armour and Compan}', Chicago, Illinois, 12 medicinal prepara- 

 tions and ten photographs; E. R. Squibb and Sons, New York City, 

 ten specimens; McKesson and Eobbins, Incorporated, New York 

 City, f^ven specimens; Parke, Da^is and Company, Detroit, Michi- 

 gan, six specimens; and photographs of domestic animals, insects, 

 and Jashes Avhicli yield medicinal substances were received liy trans- 

 fer from the Departments of Agriculture and Commerce. 



The Museum is much indebted to Dr. AV. A. Dewey, Registrar of 

 the Homeopathic jSIedical School. University of Michigan, Ann 

 Arbor. Michigan, who continued his valuable cooperation in collect- 

 ing articles and specimens to illustrate the history and principles of 

 the Homeopathic School of Medicine. The more important of these 

 contributions may be named as follows : A bronze medallion of Dr. 

 Hahnemann, " The Founder of Homeopathy," executed by the fa- 

 mous French sculptor, Pierre Jean David D'Angers. between 183C and 

 1838, was the gift of Dr. Joseph C. Guernsey of Bryn Mawr. Penn- 

 sylvania. This medallion was brought to America by Dr. Adolph 

 Ferdinand Haynel, one of tlie early homeopathic phj'sicians of Balti- 



