MICROSCOPICAL PREPARATIONS. 91 



object glass, but they may be well studied by the aid 

 of a twelfth magnifying 600 diameters. 



The nature of the particles is still doubtful. They 

 closely resemble in most of their characters the 

 minute spores of fungi. Their motion, however, is 

 not due to the particle itself, but is evidently 

 secondary, resulting from the movement of the fluid 

 in which they are suspended. It is possible these 

 minute particles may be the agents concerned in the 

 very rapid conversion of starch into sugar which the 

 saliva is known to effect. 

 MICEOSCOPICAL PEEPAEATIONS ILLTTSTEATING LECTUEE V. 



No. of diameters 

 magnified. 



19. Bioplasm taking part, in the formation of epithelium 



and skin, with vessels, nerve fibres, and other struc- 

 tures 215 



20. Epithelium of tongue and subjacent textures at birth 215 



21. Epithelium of tongue, old man aged 74 .. .. 215 



22. Papillae of tongue, vessels injected, covered and un- 



covered with epithelium, adult 130 



23. Epithelium, mouth of kitten one day old, showing 



bioplasm and formed material . . . . . . 215 



24. Epithelium, mouth of chameleon, showing large mass 



of bioplasm (nucleus) with new centre (nucleolus) 215 



25. Hairs from surface of tongue, human subject . . 130 



26. Hairs and hair bulbs from skin of the kitten. Ob- 



serve the great quantity of the bioplasm at base of 



the bulb where the new growth takes place . . 40 



27. Hair, vessels, nerves, and adipose tissue ; ear mouse. . 215 



28. Dentine and enamel, human tooth . . . . . . 130 



29. Bioplasm and prolongation torn from the calcified 



dentine, with " dentinal tubes" . . . . . . 700 



30. Enamel cells, pig at birth 215 



31. Bioplasm of periodontal membrane, showing beautiful 



stellate masses, freely anastomosing . . . . 215 



32. Liver cells, toad ; in tubes of basement membrane. . 215 

 33-i Epithelium from mouth of snake, showing large flask- 

 like cells, from the orifice secretion escapes . . 400 



34. Ciliated cells from branchiae ; oyster. . . . . . 215 



35. Pigment cells, frog ; showing pigment granules . . 130 



36. Salivary corpuscles showing moving granules within. 700 



