x 
ILLUSTRATIONS. 
Page. 
Fic. 10. Datura metelloides Inoculated by Needle- 
_ 
30. 
36. 
37 
pricks with Bacterium solanacearum. 
The same plant as in Plate 4, but six 
daysilater’ < simi eucwenasaeenaens O65 17 
. (a) Capsule of Organism plated from 
Black Spot of Plum; (b) Viscid Cul- 
ture-medium from which a was ob- 
PRINCE Me Mites mna er oe ais eo caecleriatets 18 
2. Yellow Ooze from Black Spot of Plum 
stained by ordinary method.......... 19 
3. Tenuous Threads of Bacillus tracheiphi- 
lus drawn from a Muskmelon Stem.. 19 
. A detail from Fig. 13, highly magnified. 19 
. Flagella stained from a pure culture of 
a Bacterium grown in Water contain- 
ing a few drops of Uschinsky Solution. 21 
16. Beyerinck’s Drop Bottle. .........2.5.. 21 
. Double: Blow (Bulbicesce.% 3.06 cadercessa se 22 
18. Short Form of Bacterium campestre 
when. crowded sii03 .2b.ceaateeeen es 23 
19. Long Form of Bacterium campestre 
when grown on Sugar-agar.......... 23 
. Hanging-drop Culture ................. 24 
. Involution-forms of Bacillus tracheiphi- 
WS i rcisicecidn Ne Does acln's Salsas aes eisai rattle 24 
22. Y-shaped Forms from Root-tubercles of 
CIOVER ead seems San eee as nee Able 24 
. Zeiss Compensating Ocular, with Screw 
or Filar Eye-piece Micrometer ....... 25 
. Zeiss Upright Photomicrographic Cam- 
CDA wisest eiebias sige nessa inact ae ae 26 
Hand-lens for examining Bacterial Cul- 
TUES: Th jelk Pack tew es deters oe tenasee 27 
. Hand-lens for examining Bacterial Cul- 
tures, showing another form of mount. 27 
. Zeiss Cover-glass Measurer............ 28 
Nelson’s Photographic Gelatin......... 30 
Agar-agar as received from Japan. 
(Slender' “ Kanten?)iasguads tan cee « 31 
Another form of Agar-agar made in 
Japan (Square “Kanten”).......... 32 
31, 32. Gelidiums furnishing Agar-agar... 33, 34 
. Agar-agar Flour as received from Euro- 
pean Manufacturers.................5 35 
34. Schleicher and Schiill’s Folded Filter 
Papers Seah cacee aoe sh east eee 36 
. Thermo-regulator for Blood-serum Oven. 37 
. Iris-rhizome-rot Organism grown on 
sterile Raw: Carrotescsntc%). nese ude 41 
. Tin-box in which Pipettes, Scalpels, etc., 
may ‘be sterilized): sess css camels 42 
38. Fluid Culture showing rise of Viscid 
Precipitate when twirled rapidly...... 42 
Page. 
Fic. 39. Platinum-iridium Transfer Wires ...... 43 
40. Simple way of filtering with Chamber- 
land) Bougie: 5 «sie 02 ssanmot eoeasetests 44 
41. Roux Filter for separating Bacteria 
from: their’ Products .ssc226: sasdceanet 45 
42. Section of the Arnold Steam Sterilizer, 
showing Principle of Action ......... 46 
43. Lautenschlager Centrifuge.............. 47 
44. Wire-crate for holding Media to be ster- 
{ized s 43.05 condenses viicae nus Bee ieee 48 
45. Oven for use in solidifying Blood-serum, 
etc., at Temperatures below 100° C... 49 
46. Simple Rack for holding Fermentation 
HUDOS i serene va vos ade ce aea ci seeeneeae 52 
47, 48, 49. Fermentation-tubes in actual use.. 53 
50. Ordinary Kipp Gas-generator........... 54 
51. Hempel’s Burettes for Gas-analysis..... 55 
52. Hempel’s Simple Pipette for Liquid Re- 
AVENES (os cb Sicncen somneeee Ree seen ees 56 
53, mall Noyy: Jat. .s ce ccc tecnes eden cea 57 
54. Large Novy Jar; the most convenient 
Bortii': 3; 5222s/5s0.0saacea thea teenicees 58 
55. Simple Device for growing organisms in 
NEHTOREN 2i5oo cc goed sin alae etnmie canes 50 
56. Test for Reduction of Nitrates to Ni- 
TICS oc iore 6s TOS ERR bd TSE ab 63 
57. Crystals formed in Nutrient Agar as the 
Result of Bacterial Growth........... 66 
58. Thick-walled Flask for Filtration or 
Evaporation in vacu0........0eseeees 67 
59; “Litration-devices: «<i hsica¥wcvccescosees 68 
60. Sodium-hydrate Bottle................. 690 
61. Effect of Sunlight on Pear-blight Ba- 
Cilttgo sacs Gtientes bos ce Gauis Meade 71 
62. Effect of Sunlight on Bean-spot Bacte- 
FUMIM aois siiecins dea ee ach weak eulet ea aoe 71 
63. Water-bath for Thermal Death-point 
Experiments: . ic: occ00.decigeeuaaese 76 
64. Roux Metal-bar Thermo-regulator ..... 77 
65. Thermometer for Thermal Death-point 
Experiments: 229.2 isx oc cee ceasteae es it 70 
66. Leveling Apparatus. .....c66s:.cccsees> 80 
67. Dewar Glass for Experiments with 
EAGQUIG! AG0 ys vier aiusays slersle'sienvic dynes sete = 81 
68. Petri-dish Poured Plate inoculated with 
a measured quantity of a Bouillon 
Culture of Bacillus tracheiphilus...... 82 
69. The same as Fig. 68, but poured after 
Exposure to Liquid Air.............. 83 
70. Stomatal Infection by Bacterium pruni 
an GreensPrults.a, otsectos sores ss 3 84 
71. Stomatal Infection by Bacterium pruni 
ML OAL Sc cn cieuncin ees ei berate tes hoe 86 
72. Stomatal Infection by Bacterium pruni— 
a Later Stage in Fruit............... 88 
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