302 Ward. — Some Thames Bacteria. 
That was not the case, however, as the following observa- 
tions show. As we have seen, the temperature had been 
slowly rising all the morning, as follows 
io*o a.m. 
temperature 
= 21-5 
10-20 
33 
= 22 
io *35 
35 
= 22-2,5 
11*10 
33 
= 22-5 
11-40 
35 
= 32-5 
12-20 
55 
= 22-75 
12-45 
53 
= 23-25 
3-20 
33 
= 23-5 
And I allowed this rise to go on. The numbers of 
swarmers increased enormously, and I suspected this was 
not due merely to the rapid division of those already in 
motion, but that the increase was partly due to reinforce- 
ments from the colony of resting forms. 
After some search — principally due to the difficulty of 
focussing now the drop was enlarging- — I got a very typical 
capsule enclosing six rodlets^ under observation at 3.40. The 
temperature was 24*5°, and remained there. But the rodlets 
inside this cap were no longer quiescent: they were slowly 
moving, tumbling over one another within the hyaline prison 
of the capsule. 
Numerous free swarming rodlets were now in the neigh- 
bourhood, and one saw here and there groups of about 
six to ten of apparently free ones moving about each other, 
gliding and tumbling one over the other in the same way 
as those imprisoned in the capsule referred to. 
This capsule was kept under observation from 3.40 to 4.40, 
and notes made at 3-55, 4.15, and 4.30. 
The slow swarming at 3.40 became more and more active 
as time went on, and at 4.15 was as active as in the 
apparently free swarming groups around, but the enveloping 
capsule was now swollen, and so transparent that it could 
only be known to be there by the limits its presence placed 
to the swarming movements of the imprisoned bacilli. At 
