684 PHILOSOPHICAL TRANSACTIONS. [aNNO 1683. 



Hence it appears that this comet moved retrograde, or contrary to the order 

 of the signs, its motion in the ecliptic, during the interval in the table, being 

 63° 53', but 74° 35' in its own orbit, which was inclined to the ecliptic in 

 an angle of 39°, but to the equinoctial 56°. Its latitude at first was 29° 15' N. 

 and at last 1 1° 20' S.; so that it varied its latitude almost 41°. As to the head 

 of this comet, its diameter at first was much less than afterwards; but, on the 

 other hand, it was much brighter at first than towards the end. It exhibited no 

 distinct and fulgent nucleus, as I have seen in most comets, but appeared a con- 

 fused mass of matter, which became much thinner towards the conclusion. As 

 it was seen mostly without a tail, it may be numbered among the hairy comets, 

 or those that have beards like goats; for it extended upwards its very short and 

 diluted bristles only till Aug. 18; which afterwards quite disappeared. 



Account of the Book, De Urinis, Pulsihus ; de Missione Sanguinis ; de Fehribus ; 

 de Morbis Capitis; et Pectoris: Opus Laurentii Bellini: Bononiie, l683. 

 N° 154, p. 425. 



With this work all our medical readers are so well acquainted, that to retain 

 the account of it, inserted in the Transactions soon after its first publication, 

 cannot now be desirable. 



Account of Mr. Boyle's Memoirs for the Natural History of Human Blood, 

 especially the Spirit of that Liquor. Lond. l683. N° 154, p. 428. 



This book is divided by its honourable and learned author into 4 parts ; in 

 the 1st of which he lays down some rules, concerning the way of compiling the 

 natural history of any particular subject; where he proposes that whatever occurs 

 concerning the subject to be treated of, may be ranked under several orders or 

 classes, agreeing in the general names of titles : the first or primary order, the 

 author would have to consist of such titles as shall comprehend the whole matter 

 of the subject, as it appears at first view : but when the matter of any primary 

 title encreases on hand, it will be proper that that also should be divided, ac- 

 cording to its own nature, into several subordinate branches, or secondary 

 titles. 



And further he says it will be useful that a mantissa should be subjoined to 

 the first edition of the titles, consisting of paralipomena and addenda : pursuant 

 to which method, the author gives the titles of the first order, for the natural 

 history of human blood of healthy men; and has also marked out a way for. 

 the natural history of urine. 



The 2d part contains miscellaneous experiments and observations, about 

 human blood, referable to some one of the titles of the first order : thus he 



