Scientific American Volume 59 Number 23 (December 1888) . OF. ?- BY D. Prince, An experimental study in relation to theremoval from the air of the dust or particulate to produce yellow fever, small-pox. and otherInfectious disease. 1 illustration. Contained in Scien-tific AMERICAN Supplement, No. 569. Price 10cents. To be had at this office and from all newsdealers. ERIE ENGINE WORKS CLEVELAND fit HARDWICK,Walnut Street, STATIONARY , PORTABLE , SEIvll-POR TABLE,COMB I NED,AGRICULTURALENGINES. STATIONARY , PORT-ABLE .VERTICAL BOILERS. 95 MILK ST., BOSTON, MASS. T
Scientific American Volume 59 Number 23 (December 1888) . OF. ?- BY D. Prince, An experimental study in relation to theremoval from the air of the dust or particulate to produce yellow fever, small-pox. and otherInfectious disease. 1 illustration. Contained in Scien-tific AMERICAN Supplement, No. 569. Price 10cents. To be had at this office and from all newsdealers. ERIE ENGINE WORKS CLEVELAND fit HARDWICK,Walnut Street, STATIONARY , PORTABLE , SEIvll-POR TABLE,COMB I NED,AGRICULTURALENGINES. STATIONARY , PORT-ABLE .VERTICAL BOILERS. 95 MILK ST., BOSTON, MASS. This Company owns the Letters Patentgranted to Alexander Graham Bell, March7th, 1876, No. 174,465, and January 30th,1877, No. 186,787. The transmission of Speech by allkhownforms of Electric Speaking Telephones in-fringes the right secured to this Companyby the above patents, and renders eachindividual user of telephones not furnish-ed by it or its licensees responsible for suchunlawful use, and all the consequencebthereof, and liable to suit PATENTS. MESSRS. MUNN & in connection with the publi-cation of the Scientific American, continue to ex-amine improvements, and to act as Solicitors of Patentsfor Inventors. In this line of busmess they have had forty-one yearsexperience, and now nave unequaled facilities for thepreparation of Patent Drawings, Speciflcationa, and theprosecution of Application-j for Patents in the UnitedStates, Canada, and Foreign Countries. .Messrs Munn <fcCo. also attend to the preparation of Caveats. Copyrightsfor Books. Labels, Reissues. Assignments, and Reportson Infringements of Patents. All business intrusted tothem is done with special care and promptness, on veryreasonable terms A pamphlet sent free of charge, on appjication, con-taining fuUinformation about Patents and how to pro-cure them; directions concerning Labels, Copyrights,Designs, Patents, Appeals. Reissues, Infringements, As-signments, Rejected Cases, Hints on the Sale o
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