570 PHILOSOPHICAL TRANSACTIONS. [aNNO 170J. 



the two opposite points in the fixed circle to tlie perpendicular, which is done 

 at the fixing the instrument, move the circle till the day of the month come to 

 any of these, and the ring is rectified for that day ; and if the air he clear, you 

 will see the star stand at the true time of the day or night. 



Mr. Flamsteed has lately discovered, that there is a parallax of the earth's 

 annual orbit at the pole star, of about 40 or 45 seconds, by which the dia- 

 meter of the star's parallel is greater in June than in December, by about l' 

 1", which he has evinced from ^ years' successive observations, by which the 

 earth's motion is indubitably demonstrated. . 



Now if on the edge of this index there be drawn a scale of deg. min. and 

 sec. to the radius of the glass, we shall not only have a very accurate instru- 

 ment for the hour, but be furnished with one by which we shall see the truth 

 of the earth's motion confirmed by the access and recess of our star, towards 

 and from the pole, according to the earth's place in the ecliptic ; and that not 

 only when the star transits the meridian, but in clear air at any time of the 

 day ; we may likewise observe that annual increase of the pole star's declination^ 

 caused by the precession of the equinox. - 



Concerning Poiudered Blues passing the Lacteal Veins, &c. Bi/ Dr. Martin 



Lister, F.R.S. N° 270, p.- 8ig. 



It has been experimented both by myself, and at Oxford by Dr. Musgrave, 

 with surprising success, that a dog kept long fasting would not only admit 

 into the lacteals a tinctured liquor, but a very substantial one, such as powdered 

 blue. And therefore to account for fevers and the obstruction of the glands, 

 we must admit of crude, and otherwise vitiated chyle, as well, if not ofiener, 

 than the external accidents from cold and heat, and tiie disorderly temperature 

 of the air. 



The Transactions are single tracts, and have been very uncertainly published, 

 so that the gentleman who is of the contrary opinion, might not have seen 

 some of the former, or forgot the passages relating to this experiment ; what 

 makes me believe he has not read them all is, that he has assigned the ordinary 

 quantity of blood in a human body to be 20 pounds, according to that ground- 

 less and most extravagant guess of Dr. Lower ; whereas if he had perused them 

 all, he would have found a most certain proof, by Dr. Molins, that the blood 

 of all animals is but as 1 to 20 of their weight, and therefore that of man, at 

 a medium, not to exceed 8 pounds. 



On the Spawn of Cod-fish, &c. By M. Lemuenhoeck . N° 270, p. 821. 

 About the middle of January I observed for several days the spawn of a live 



