(r. H. F. Nuttall Do 
No. of (lays 
No. of days 
Temperature 
Date of 
elapsing 
tick sur¬ 
at which the 
collecting 
before 
No. of (lays 
vived after 
No. of 
mother ticks were 
Lot 1308 
gorged females 
oviposition 
oviposition 
oviposition 
eggs laid 
maintained from 
No. 
from host 
began 
lasted 
ended 
by tick 
time of receiiit 
1 
2ti. IV. 1911 
17 
4.5 
8 
— 
24° C. 
2 
18 
44 
7 
— 
3 
1. V. 1911 
17 
32 
8 
— 
4 
)> 
17 
32 
7 
— 
J 9 
5 
95 
17 
43 
5 
— 
9 9 
6 
5 5 
18 
43 
10 
— 
9 9 
7 
55 
17 
40 
8 
— 
5 9 
8 
5 } 
17 
41 
8 
2400 
9 9 
9 
19 
17 
40 
1 
— 
10 
17 
40 
0 
— 
11 
9 9 
17 
— 
— 
2400 
9 9 
9 9 
12 
99 
17 
— 
— 
3200 
13 
5 9 
24 
— 
— 
2600 
99 
Longevity of larvae. 
Larvae (Lot 417) which emerged 10. vill. 1908, survived unfed in 
a corked bottle until after 2. ii. 1909 = 176 days, at 12^ C. They were 
lively when last examined. 
Summary. 
This summary merely relates to the observations on Ixodes 7-icinus 
recorded in this paper: 
The larvae remained upon a calf for 4-10 days at 16° C., the nymphs 
remained upon a ram for 3-6 days and the adults (females) for 4-7 days 
at 6°C. The time required for metamorphosis from the egg to the 
larval stage was 49-62 days at 15-20° C., from larva to nymph 124 days 
at 10° C. Oviposition began 17-24 days after the replete and fertilized 
females abandoned the host, the process lasted 32-45 days at 19° C. and 
the females laid 2400-3200 eggs. Females may survive 0-10 days after 
oviposition has ceased. Unfed larvae survived and were lively after 
176 days at 12° C. in a corked bottle. 
The larvae (Lot 1308) were the progeny of gorged females removed 
from cattle suffering from redwater in Co. Galway, Ireland. When 
placed upon a clean calf in Cambridge they produced piroplasmosis due 
to Piroplasma divergens. 
HAEMAPHYSALIS LEACHI. 
Mr Charles P. Lonnsbury, formerly Government Entomologist, Cape 
Colony, was the first to raise this tick experimentally and to demon¬ 
strate that it transmits canine piroplasmosis in Africa. The protocols 
of his experiments (1901, pp. 5-6 ; 1902, pp. 5-7 ; 1904, pp. 27-29) give 
