[ 265 ] 



Xi0t of plates. 



Cells of Saccharomyces cerovisic^ 

 Custata Gronovii 

 Development of the Tadpole 



Eye of a Fly 

 Gamasidae 

 Geological Strata 

 Head of a Lady-Bird 

 Mammalia 



Microgaster Glomeratus 

 Microscopical Imagery 



Phenacodus Primasvus 

 Spider, Longitudinal Section of 



