656 PHILOSOPHICAL TRANSACTIONS. [aNNO I67I. 



V. Goth. Voigtii Deliciae Physicae. Rostochii, A. 1671, in 8vo. 



This author entertains his readers with divers marvellous subjects, such as are 

 the bleeding of persons killed, at the presence of the murderer; the tears of 

 crocodiles; the licking of new whelped bears by their dams; the love between 

 wolves and sheep ; fossil fishes ; the casting of horns by deer, &c. 



The Ohsei'vations of the Spots of the Sun, made at the Royal Academy 

 at Paris, contijiued.^ N" 78, p. 3020. 



The observation of these solar spots having been noted in the first paper as 

 far as the 13th of August, the present paper continued the account of them as 

 far as to the 19th of the same month. From which it is inferred that the ap- 

 parent velocity of the spots, when they approached to the sun's centre, gave 

 room to determine their apparent periodical revolution about the sun's axis, about 

 27-1 days,-!" supposing them to be adherent to his surface, or at least very nigh 

 to it; and consequently that from the morning of the 13th of August, when 

 they were near his centre, they should take between six and seven days to arrive 

 at the limb of his apparent disk, which has come to pass accordingly. For, since 

 the morning of the 13th unto the evening of the IQth, when they were seen 

 nigh the limb, there are 64- days; and then they were yet so far distant from it 

 that it was easy to judge they would not come out that day. The clouds and 

 night then hindered the observation, but in the morning of the 20th, which 

 was not the full seventh from the day that they were arrived to the middle of 

 the disk, they had disappeared. This likewise agrees well enough with what had 

 been practised, viz. that these spots during the fourth part of the time of their 

 motion about the sun's centre, calculated according to this hypothesis, and upon 

 the first observations, would remain in the western quadrant. 



The apparent velocity near the centre was such, that if it had continued the 

 same, the spots would have arrived almost in four days to the limb of the disk; 

 but in this hypothesis this apparent velocity was to lessen according as the spots 

 should remove from the centre; as has come to pass in eflTect. The diminution 

 of the length of the misty crown was in a manner proportionate to the diminu- 

 tion of the apparent velocity; since that, when this crown was in the middle, 

 and in a situation wherein its true figure could be best seen, it appeared oblong, 

 and of the form of the human ear, its greatest diameter respecting east and west; 

 but being nigh the limb, this same diameter seemed to shorten ; and having 



* See the beginning of them in No. 75. 



+ By later, and more correct observations, the sun's rotation on his axis has been stated at 25 days 

 10 hours. 



