248 
Liver Rot of Sheep 
L. truncatula will readily float upon the surface film in quiet water, 
and I have frequently observed this to take place under natural con¬ 
ditions, and no doubt the snail may at times be thus transported down 
stream for short distances. 
Growth rates have already been mentioned and as temperature 
largely governs this some notes were made from time to time at varying 
dates and elevations and it may be of interest to give a selection here. 
The shallow streams inhabited by L. truncatula are evidently rapidly 
affected by the air temperature and thus by temporary climate con¬ 
ditions. In all the examples given below truncatula was present in 
abundance. 
Effects of Temperature. 
1. Near Ysbytty Ystwyth, 700 ft. Dec. 1st, 1913, Air 56° F., Water 49° F. 
2. Near Ysbytty Ystwyth, 800 ft. Dec. 10th, 1914, Air 42° F., Water 41° F. 
Note. White frost morning and evening, Cercariae given off by snails. 
3. Near Ysbytty Ystwyth, 800 ft. Jan. 21st, 1915, Air 36° F., Water 38° F. 
Rediae in an advanced condition were present in snails. 
4. Capel Bangor 120 ft. March 17th, 1916, Air 57° F., Water 53° F. 
A still warm day following white frost, sunny situation. 
5. Glandyfi, 25 ft. (about) March 13th, 1915, Air 52° F., Water 49° F. 
6. Near Ysbytty Ystwyth 700 ft. March, 1915, Air 39° F., Water 41° F. (swift), 
Water 40° F. slow flow. 
7. Llanrhystyd Road 70 ft. (?) March 31st, 1915, Air 55° F„ Water 51° F. 
A warm wet day, 4 p.m. 
8. Near Ysbytty Ystwyth 900 ft. April 8th, 1914, Air and Water 47° F. 
9. Near Ysbytty Ystwyth 1100 ft. April 8th, 1914, Air and Water 46° F. 
10. Llanrhystyd 70 ft. (?) June 16th, 1914, Air 64° F., Water 59° F. 
11. An interesting series of observations were taken on Feb. 24th, 1916, during 
a walk from Devils Bridge to Crosswood during a bitter east wind and snowstorm. 
(a) Near Devils Bridge, 800 ft. noon, somewhat sheltered, Air 36° F., Water 
37° F. 
( b) Near Devils Bridge, 800 ft. 1.30 p.m., exposed to wind. Air 33° F., Water 
34° F. 
(c) Near Crosswood 250 ft. 3 p.m., sheltered streamlet, and under the lea of the 
mountains, 5 miles from (b). Air 36° F., Water 41° F. 
During the very severe and prolonged frosts of the winter of 1916-17, 
attempts were made to procure specimens of L. truncatula from a ditch 
near Aberystwyth, but without success, notwithstanding the extreme 
severity of the weather, this ditch and a number of others, all shallow, 
and in exposed situations, contained L. truncatula in abundance, and 
of all sizes in Maroh-April, 1917 ; while the deposition of ova commenced 
as usual during the latter month. 
