146 DESCRIPTION OF PLATES 



PLATE III 

 Low POWERS BY TRANSMITTED LIGHT 



FIG. 7. Carcinoma of Mammary Gland. 

 For details, see page 62. 



FIG. 8. Suctorial Tubes in Tongue of Blow-fly. 

 For details, see page 63. 



PLATE IV 

 MEDIUM POWERS BY TRANSMITTED LIGHT 



FIG. 9. Aulacodiscus Oreganus. Diatom. 

 For details, see page 67. 



FIG. 10. Human Voluntary Muscle. Injected. 

 For details, see page 69. 



PLATE V 

 HIGH POWERS BY TRANSMITTED LIGHT 



FIG. ii. Karyokinetic figure in a Leucocyte. Human. 

 For details, see page fi. 



FIG. 12. Pleurosigma angulatum. "White dot" resolution. 

 For details, see page 73. 



PLATE VI 

 DARK-FIELD ILLUMINATION 



FIG. 1 3. Anchors and Plates of Synapta. Grouped. 

 For details, see page 75. 



FIG. 14. Heliopelta euleri. (Sunshield Diatom.) Dr. Mer- 

 cer's Method. 

 For details, see page 76. 



