278 Microscopical Researches in High Power Definition. 



Figure 6. Crescentic and tubular shadows. Degeeria domestica. 



Figure 5a. Same object obliquely illuminated, after Mr. Mclntyre. 



Figures a, (3, y . . . 9. Refracting globules of melted glass filaments and refracting 

 splierules. The black annulus varies in thickness, as described according 

 to the conditions of refraction and the degree of angular aperture. 



Figure 9 represents the spider-lines in the field of view. Minute black dots 

 appeared on some of the mercurial mirrorlets, but too small for the' 

 writer to depict. Where the spider-lines crossed the minute reflecting 

 circlets they appeared intensely black, but otherwise were seen plainly 

 black upon a dark grey ground. The experiment is difficult of success- 

 ful performance. 



Figure 10. Highly magnified Degeeria spherules, with l-50th object-glass. 



Figure 11. Spherules of Degeeria, after Mr. Mclntyre. " Monthly Microsco- 

 pical Journal," 1870, p. 5, vol. iii. 



Figures a, b, c. Successive views of spikelets of scale Petrob. maritimus, "end on,'* 

 and in different focal planes, an extremity being one spherule. Plate 4. 



Figure 12d. Black beaded appearance of spikelets and ribs. Same scale. 



Figure 13a. Plume of Meadow-brown seen with low aperture, l-80,000th inch thick 

 being size of the fibrils. (Hipparchus Janira.) 



Figure 135. The same, with large angular aperture. 



Figure 14. Young beaded scale of Podwa macrotoma. 



Figure 15. Mature scale ; cross rouleaux of molecules developed ; loose sjmerules 

 escaped after pressure. 



Figure 16, Highly magnified spikelets and transverse spherules in lower focal plane. 

 Power 3,000, Seibert of Berlin l-32nd, No. XI objective. 



Figure 17. Extraordinary double or compound amplification of ciliary hairs growing 

 on antennae of male gnat ; produced by an irregular oil globule adhering 

 to the stem. The most wonderful power ever seen by the writer, and 

 suggestive of further experiment, the cilia here being otherwise invisible. 



Figures 18, 19, 20, and 21. Different appearances of the Pod. macrot. in higher, 

 middle, and lower focal planes, 21 being a strongly marked beaded scale c 



Figure 22. Grnat scale fortuitously discovered, and one similar to the scale shown, 

 figs, a, b, c, Plate 4. One surface being ribbed, the other perfectlj 

 smooth. The intense blue-black is not shown : caused by the arrest of 

 rays of light and the beauty of the definition as in lunar shadows. 



