XXU CONTENTS, 



Page 



Bat's hair 467 



Mouse liair 468 



Hair of Dermestes 469 



Scales of Hipparchia janira >b. 



Scales of Pontia brassica 470 



Scales of Polyommatus Argiolus ib- 



Scales of Podura ib. 



Scales of Lepisma saccharina 472 



Scales from the gnat's wing - ib. 



Battledoor scale of Polyommatus Argiolus ib. 



Scale of Morpho Menelaus 473 



Navicula Hippocampus ib. 



Navicula Angulata 474 



Nobert's tests 475 



Method of examining test objects 479 



Method of using the adjusting object-glass ib. 



CHAPTER XXI. 



Miscellaneous Hints on the Management of the Microscope 



AND MiCKOscopic Preparations. 



Apartment 483 



To clean the optical part of the microscope 484 



Glass sKdes, to clean ib. 



Cabinets and boxes for holding microscopic objects ib. 



Labelling slides 486 



Mr. C. Brooke's method of viewing opaque objects 487 



of making thin glass cells - 488 



of mounting opaque objects in fluid ib. 



of cementing cells ib. 



of erecting the object for drawing, &c. ib. 



appp:ndix. 



Mr. Highley's achromatic gas lamp - 489 



M. Nachet's microscope for chemical observations 490 



Mr. Hett's microscopes for injections, &c. 492 



Mr. Ross's improved achromatic microscope 495 



Mr. Kingsley's illuminator 499 



Messrs. Smith and Beck's improved microscopes 500 



Scale of Amathusia Horsfieldii 501 



New test objects - 502 



