TTrttiAV OpTn-RWT? IQ IQOf) single copies, 15 cts. 



jrKlUAY, UCiOBJiK !», lOVV. Annual Subsceiption, S5.00. 



Chemicals and diemical Apparatus 



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KOCH'S Incubator 



NEW AND IMPROVED FORM, TO WORK WITH A PE- 

 TROLEUM LAMP. INDISPENSABLE WHERE 

 GAS IS NOT AVAILABLE 



Furnished in Four Different Styles and Sizes from $25.00 upwards 



