4io Mr. de Luc on 
lowing terms in the three columns of weights, which are 
marked with an *, have only been added (as I have explained 
for the former Table) with the view of having a common mo- 
dulum between the changes of weight and the marches of the 
other inftruments. But the obferved terms remain in their 
original proportions, and from thefe we may fee, that the march 
of the flip of whalebone does not differ much from the fuccef- 
five increafe of weight in its own fubftance ; and that when 
taken out of the apparatus, and immediately plunged into 
•water, it proceeds in the fame direction as before, till it has 
attained its fixed point, while the hair takes, comparatively 
with the increafe of weight of its own fubftance, great ftrides 
in the beginning of its march, and very fmall fteps in the latter 
part of it, before ioo; and then retrogrades a little, when 
taken out of the apparatus, and plunged into water. We fee 
befides in that table, that the thread of aloes-pitta, which at 
firft takes ftill greater ftrides than the hair , has, after a longer 
flationary or undetermined ftate, a determined beginning of 
retrogradation at the fame time that its own fubftance conti- 
nues to acquire weight in the apparatus, and continues that 
retrograde march when, being taken out of the veflel, it is 
plunged into water. 
90. The following table will farther illuftrate thefe cha- 
ra&eriftic differences of flips and threads , the afcertaining of 
which was fo effential to hygromelry. 
III. Table 
