ich Exhibition, including Wiede-manns bifilar galvanometer; Wiedemanns galvano-meter for strong currents; Zengers differential photo-meter; Von Beetzs solenoid; apparatus for demon-strating the principle of the Gramme machine; VanRysselberghes thermometrograph; Von Beetzs chro-nograph; and… … JSIDREERS eaaasEEPs PlantsT Bulbs, and Requisites. They are the best at the lowest prices. Calendar for 1885 mailed Free. Address, HENRY A. DREER CHESTHUT ST. PHILA. RELATIONS OP THE SOIL TO HEALTH. —By Geo. H. Robe, M.D. The soil. Ground air.Ground water. Diseases spread by soil…
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