INDEX AND GLOSSARY. 419 



Haustellum, 177 (Lat. haustellum, a sucker). 



Haematin, 103 (Gr. haima, blood). 



Heart, 208. 



" in insects, 178. 



Haversian Canals, 196. Vascular canals in bone. 



Hepaticde, 154. Liverworts (Gr. hepar, the liver). 



Hepatic Lobules, 210. Elemental structures of the liver. 



Herapathite, 113. lododisulphate of quinia. 



Heterologous Formation, 263. A tumor differing from the 

 tissue it is found in. 



HerscheVs doublet, 22. 



High powers, 55. 



Hipparchia Janira, 56. A species of Lepidoptera. 



Histo-chemistry, 185. 



Histology, 128, 182 (Gr. histos, tissue, and logos, discourse). 

 The science of tissues. 



Histological preparations, 224. 



Holothurise, 168 (Gr. Jiolos, the whole, and thura, a gate). 

 An order of Echinodermata. 



Holland's triplet, 23. 



Homologous Formation, 263. A tumor similar to the tissue 

 in which it is found. 



House-fly, 339. 



Huygenian eye-piece, 26 



Hydroids, 165 (Gr. hydor, water, and ezWos, resemblance). 

 A class of Ccelenterata. 



Hydrocyanic acid, test for, 107. 



Hypersemia, 246 (Gr. hyper, excess ; haima, the blood). 



Hypoblast, 202. The lower layer of the blastoderm. 



Illumination, 22. 



Illuminators, oblique, 34. 



dark-ground, 35. 



Indigo-carmine fluid, 70. 



India-rubber, 133. 



Imbedding tissues, 62, 227. 



Immersion Lenses, 25, 51. Objectives requiring fluid between 

 them and the object. 



Improvements in microscopes, 345. 



