Louping-ill, or TREMBLING, a disease epidemic or endemic in sheep and lambs in cold spring weather, characterised by tremblings, loss of power, contraction of the gullet, and odd motions like involuntary 'louping' (leaping). The brain is affected, and sometimes the lungs and heart.
Louping-ill
Chambers's Encyclopaedia, Volume 6: Humber to Malta, p. 728
Source scan(s): p. 0743