10 



THE IINIVEKSE. 



Even the measurement of the most minute microscopic 

 details has acquired a degree of precision surpassing every- 



thing that couhl be imagined. 



There are glass micro- 



3. Investigator of the infinite!}^ little — Achromatic Microscope, l>y Thomas Ross, London.-^ 



meters in which each millimetre" is divided into 500 parts, 

 or lines, of such tenuity, that the most practised eye 

 cannot make them out. This is effected l^y means of an 

 instrument of extreme delicacy, which only works in the 

 dead of night, when all things being wrapped in sleep, 



^ Scale one-fifth. It is called the Student's Microscope, costs £lO, and forms 

 au excellent basis to which additional powers and apparatus can be added. 

 - Equal to 0-39371 inch. 



