DESCRIPTION OF PLATES. 



In the examination of these Plates the observer is 

 requested to remember that they are not all drawn to 

 the same scale. Some objects, adapted for low powers, 

 are only magnified a few times, whilst smaller objects 

 are magnified many hundred times. All objects, of 

 course, vary in apparent size, according to the powers 

 with ivhich they are examined. Descriptions of the 

 objects will be found in the pages indicated. 



PLATE I. to face page 1. 



FIG. PAGE 



1. Vegetable cells with nucleus from apple 31 



2. Cellular tissue from pith of elder 31 



3. Stellate cell-tissue from rush 32 



4. Flat tabular cell from surface of tongue 91 



5. Ciliated cell from windpipe of calf 91 



6. Human blood corpuscles 91 



7. Blood corpuscles from fowl 92 



8. Blood corpuscle from frog , 92 



9. Blood corpuscle from sole 92 



1 0. Blood corpuscle from beetle 92 



11. Filament of a species of Zygnema, a plant 60 



a. Portion of a filament of the same, the cell- 

 contents becoming changed into zoospores. 

 &, Zoospore more highly magnified. 



