LIST OF ILLUSTRATIONS. 



PAGE. 



36. Laboratory Water-bath for Melting Solid Media in Tubes, 114 



37. Koch's Inoculation Syringe, 116 



38. Sternberg Bulb. (From - ), 118 



39. Levelling Tripod Bearing a Dish of Cracked Ice, Covered by a Glass Plate. 



On the Plate a Level and Bell Jar; Beneath the Latter a Culture Plate,. . 126 



40. A. Sedgwick -Tucker aero-bioscope. B. Glass Tube of Hesse's Apparatus,. . 130 



41. Collection Filter, for Use in Concentrating Bacteria from a Large Amount 



of Water, 138 



42. Bottle in Frame, Arranged for Collecting Water from Definite Depths and 



Replacing Stopper after Entrance of Water, 140 



43. Harpoon for Collecting Soil from below the Surface of the Ground, 144 



44. Sectional View of Incubator, 152 



45. Thermostat, 154 



46. Murrell Gas Pressure Regulator, 156 



47. Large Class Incubator with Interior Warm- water Tank, and Wire-cage 



Drawers, Wall of Wood, Covered with Felt, 158 



48. Anaerobic Jar, 160 



49. Kip Gas Generator and Wash-bottle, 162 



50. Mode of Counting Colonies in an Esmarch Tube, 164 



51. Gross Cultural Appearances, Non-liquefying. (After Chester), 176 



52. Types of Liquefying Cultures. (After Chester), 178 



53. Shapes of Colonies. (After Chester), 180 



54. Shapes of Colonies. (After Chester), ; 180 



55. Surface Characters of Colonies. (After Chester), 182 



56. Characters of Edges of Colonies. (After Chester), 184 



57. Diagram of the Hanging Drop. (From - ), . . . . 190 



58. Stewart Forceps for Cover-glasses. (From ), 192 



59. Tray of Staining Tubes, 198 



60. Grouping of Bacteria, ' 210 



61. Structure of a Bacterium. (After Migula), 212 



62. Types of Capsule Bacteria, 214 



63. Flagellation of Bacteria, 214 



64. Reproduction of Bacteria, 220 



65. Types of Sporulation, ' 222 



66. Types of Germination of Spores, 222 



67. Salomonsen's Capillary-Tubes Inclosed in Protective Glass Tube, with Latter 



Attached to Card on which are Preserved Notes of Colonies Within, 250 



68. Different Forms of Animal Holders, . . .280 



