294 A Trilnite to the Memory of 
exposed to’ a moderate: increase of tempera 
ture, The remainder of the paper is chiefly 
occupied with the details of the operations; 
then’ practised, for dyeing Turkey red’; with 
a'theory' ‘of the process ; and with ageneral 
view of the mode of’ action of the individual 
mordants or basés.’ | The mhethods of* dyeing 
Turkey red’ have’ been since! much improved 
atid simplified, though its theory! i8, even yet} 
far from being well understood. But the opi: 
nions, inculeated by Mr. ‘Henry respecting 
the action of’ mordants, evince a Temarkabtle 
superiority to the prejudices, ' with which he 
found the ’subject ehcitinbered; ‘and are, in: 
deed, thosé which are ‘still’ ‘held | by the latest 
and best writer ‘on the prineiptes ie practice 
of Dyeing.’ lasidneq, thoes y 
“Tn the year aac" “at vialhailbe arose out 
of this society, which hdd’ great ‘merit, not 
only in ‘its plan and objects, but i in the ability 
exerted by the several persons, who were con- 
cerned in their fulfilment. It was destined to 
occupy, in a rational and instructive manner, 
the’ evening leisure ‘of young men, whose 
time, during the day, was devoted to commer- 
cial employments. ' For this purpose, regular 
courses of Lectures were delivered on the 
Belles Lettres, on Moral Philosophy, on Ana- 
tomy and Physiology, and on Natural Philo- 
