Bae 
NOTE ON THE DISTRIBUTION OF D/ATOMA HIEMALE 
IN EAST YORKSHIRE, ETC. 
R. He PHIEIP; 
Hull 
In a sequestered dell, hidden away among the swelling Wolds, 
the springs of Weedley come to daylight at the base of the 
chalk, picturesquely overshadowed by hawthorn bushes at the 
source, then winding serpentine fashion through dense masses 
of willow herb and lush grasses, till passing under the Hull and 
Barnsley Railway the little stream forms the valley of Drewton 
dale. The Wold Springs, of which there are so many in this 
district, are some of the most interesting habitats of our fresh 
water diatoms, and in them are found many of our finest and 
rarest species. But we were not destined to find anything 
either fine or rare on the occasion of the visit of the York- 
I 2 a 
Fig. 1. Diatoma hiemale Sertigthal, Switzerland. 
Fig. 2. AC aA Weedley Springs, near Hull. 
Fig. 3. i nA var, mesodon Chiavenna, Italy. 
shire Naturalists’ Union on June 22nd. The margin of 
the brook was indeed fringed for all its length with flocculent 
brown streamers, indicating the copious presence of diatoms, 
but subsequent examination proved that this consisted almost 
exclusively of a single species—Dvatoma hiemale (Lyng.), Heib. 
And yet there are some interesting facts connected with this 
form which it may be worth while to put on record. Fifty 
years ago, when the late George Norman was working this 
Naturalist, 
