G. H. F. Nutt all 
145 
Engs fed on 
Series A 
30. iv. 1907 
Series B 
27. v. 1907 
3. v. 1907 
2. iv. 1907 
2. iv. 1907 
Experiment I, 
at 12° 
C. 
Time when bug 
was examined 
after feeding 
Appearances of spirochaetes in gut-contents 
Fresh 
Stained 
10, 15, 15 mins. 
Many, very active 
Rigid spirals, few wormlike spirochaetes, 
all stain well incl. red blood corpuscles. 
lj Itj brs. 
Ditto, some spir. sluggish 
Ditto. 
21, 27 „ 
All fairly active 
Ditto. 
48,741 „ 
Fairly active, 
sluggish 
some 
Ditto, but some r. b. e. stain faintly. 
95 
All fairly active 
Ditto. 
100, 117 „ 
Sluggish 
Ditto. 
139 
Saw only one moving : 
sluggish 
Ditto. 
164, 190 „ 
Motionless 
Ditto. 
210, 234 „ 
9 9 
Ditto, corpuscles few and vanishing. 
254, 278 „ 
99 
Ditto. 
Experiment II, 
at 14 c 
' C. 
122 hrs. 
Very slight motion, spir. 
tangled 
Many spirals, few wormlike, stain well ; 
r. b. c. traces ? 
144 „ 
Slight motion ? 
Ditto. 
167, 198, 213 hrs. 
Motionless 
Nor. b. c. seen, spir. stain well. 
Experiment III, 
at 16 
;° c. 
10 mins. 
Many, very active 
Many, all wormlike. 
3J, 6^ hrs. 
Fairly active 
Few wormlike, mostly spirals. 
19 
Active, in bunches 
Mostly spirals, some thick, beaded or 
irregular ; r. b. c. stain well. 
28 
Fairly active, some 
motionless 
Ditto, many spir. appear thick. 
42 
Slight motion 
Spirals stain faintly, r. b. c. vanishing. 
72 
Not examined 
No. spir. found, no r. b. c. 
92, 117 ,, 
99 99 
Fairly numerous spir., stain well. 
139 „ 
Few, motionless 
Ditto, but stain faintly. 
Experiment IV, 
at 20 
° C. 
3^ hrs. 
Fairly active 
Spirals and r. b. c. both normal. 
6 
Fairly active, some 
motionless 
Spirals, some beaded and irregular, 
r. b. c. vanishing. 
00 
Motionless 
Spirals, dividing forms, beaded and 
irregular forms, very few r. b. c. 
22i, 3i m 
99 
Mostly faint-staining, often fragmented, 
few or no r. b. c. 
46,72 „ 
9 9 
Ditto, but no r. b. c. 
92 
9 9 
Ditto, but very few pale spir. found. 
119 „ 
Very slight motion ? 
Well stained. 
139 to 331 hrs. 
Not examined fresh 
None found (series of 8 bugs examined). 
