COLOURED PLATES. 



PLATE 

 I. THE MICROSCOPE APPLIED TO THE STUDY OF CRYSTALS . . . Frontispiece. 



1. Blood-crystals (magnified 700 diameters).- -2. Crystal extracted from 

 lobster-eggs (100 diameters). 3. Crystals of Santonin seen with 

 polarized light (50 diameters). 4. Mosaic gold (66 diameters). 5. 

 Crystals of chlorhydrate of ammonia (100 diameters). 6. Crystals 

 of sea-salt (100 diameters). 7. Crystals of Titanium (60 diameters). 

 8. Crystals of bichromate of potassium (100 diameters). 9. 

 Native fibrous copper (60 diameters). 



II. THE STEAM FIRE-ENGINE AT WORK ..;.... To face page 58 



III. THE MICROSCOPE APPLIED TO THE STUDY OF VEGETABLES, To face page 236 



1. Thin section of ebony (350 diameters). 2. Vegetable sections 

 (350 diameters). 3. Hair of the nettle (150 diameters). 4. Bed 

 sea-weed (60 diameters). 5. Hypatica (250 diameters). 6. Truffle 

 (350 diameters). 7. Grains of pollen. 8. Gilly-flower (350 dia- 

 meters). 9. Cedar-wood (350 diameters.) 10. Transverse section 

 of the middle of a box-leaf. 



IV. THE MICROSCOPE APPLIED TO THE STUDY OF ANIMALS . To face page 242 



1. Blood-corpuscles (900 diameters). 2. Distribution of blood-vessels 

 in the brain (60 diameters). 3. Polycystina from Barbadoes 

 (60 diameters). 4. Tissue underlying the shell of a crab (250 

 diameters). 5. Bony tissue (250 diameters). 6. Infusoria of 

 the genus Kolpoda (900 diameters). 7. Ketina of a bird (500 

 diameters). 



I 2 



