'the changeable Stays. 2 ~o t 
33 4 ^ from 2 obferv. compared toy Cygni, made in July and Auguft, 1 783. 
295 33 45 from 2 ditto, compared to y Lyras, ditto. 
29 5 33 45 from I ditto, compared to a Lyras, made in Auguft, 1783. 
295 33 55 from 3 ditto, compared to $ Lyrae, made in July and Auguft, 1783. 
295 33 5 * 1 2 3 4 5 6 from 2 ditto, compared to $ Cygni, made in Auguft 1783* 
295 33 48! mean right afcenlion for Auguft j, 1783, on a mean . 
Variable in the Swan’s Breath 
This ftar was firft feen by G. Jansonius in 1600, and 
afterwards frequently obferved by different aftronomers, but 
with intervals of ten or more years, which is probably the 
reafon why no regularity in its changes has yet been deduced. 
1 have examined minutely the obfervations made in the laft 
century, and ftiall venture to give the following refults. 
1. Continues at its full brightnefs for about five years. 
2. Decreafes rapidly during two years. 
3. Invifible to the naked eye for four years. 
4. Increafes flowly during feven years. 
5. All thefe changes, or its period, are completed in it 
years. 
6. It was at its minimum at the end of the year 1663. 
It does not always increafe to the fame degree of brightnefs, 
being fometimes of the 3d, and at other times only of the 6th 
magnitude. I am intirely ignorant whether it is fubjedt to the 
fame changes fince this century, having not met with any feries 
of obfervations on it ; but if the above conjectures are exadt, it 
will be at its minimum in a very few years. Since November, 
3781, I have conftantly feen it of the 6th magnitude, being 
rather lefs than N° 28, 29, and m , and rather brighter than 
Vol. LXXVL Dd 36 
