339 



with the moon's parallax and declination, together with the date and 

 corresponding time and height of high water ; the height of the baro- 

 meter is also added to the observations of about four years. The 

 second book contains the same quantities, classified further according 

 to the different calendar months, and for each minute of the moon's 

 horizontal parallax. The third book contains a similar classification 

 for the moon's declination. The average results are given in tables 

 at the end. 



Some remarks are subjoined on the registers of the observations 

 taken at the London and St. Katherine's Docks; from which it appears 

 that the tide is about five minutes earlier in the former than in the 

 latter of these two places ; and that the difference in height is about 

 five feet. 



" On the Star-fish of the genus Comatula, demonstrative of the 

 Pentacrinus Europtsus being the young of our indigenous Species." 

 By John V. Thompson, Esq., F.L.S., Deputy Inspector General of 

 Hospitals. Communicated by Sir James Macgrigor, Bart., F.R.S. 



The author states that the Pentacrinus Europceus, which is fixed by 

 its stem to other bodies, and consequently deprived of the power of 

 locomotion, is produced from the ova of the Comatula, and becomes 

 in a subsequent stage of its evolution detached, assuming the form of 

 this genus of Asterida, and capable of moving freely in the ocean ; at 

 one time crawling amongst submarine plants, at others floating to 

 and fro, or swimming in a manner similar to Medusa. 



" On the Ova of Women and Mammiferous Animals, as they exist 

 in the Ovaries before Impregnation." By Thomas Wharton Jones, 

 Esq. Communicated by Robert Lee, M.D., F.R.S. 



After reviewing the accounts given by various authors of the struc- 

 ture of the ovaries, corpora lutea, and ova in different tribes of ani- 

 mals, the author proceeds to the anatomical description of the ovaries 

 in the human species, which he finds to correspond with those of the 

 Mammalia generally, and to consist of a parenchyma or stroma, and 

 an envelope or indusium, derived from the peritoneum. The stroma 

 immediately under the peritoneal envelope is condensed into the form 

 of a tunic, to which the peritoneum closely adheres, and which has 

 received the name of the tunica alhuginea, ox indusium proprium. The 

 vesicles of De Graaf are imbedded in this tunic, and are situated prin- 

 cipally near the surface of the ovary : in the human species they are 

 about one fifth of an inch in diameter. The proper capsule of the 

 Graafian vesicle is composed of two layers ; the outer being thin, 

 dense, and vascular ; the inner, thicker, softer, and more opaque. The 

 nucleus of the vesicle consists of, 1st, a granular membrane; 2ndly, 

 a coagulable granular fluid inclosed in the membrane; 3rdly, a circular 

 mass or disc of granular matter, termed by Baer the proliferous disc, 

 connected with the granular membrane on the prominent side of the 

 vesicle, and presenting in its centre, on the side towards the interior 

 of the vesicle, a small rounded prominence, called the cumulus, and 

 on the opposite side a small cup-like cavity, hollowed out of the cu- 



2c 2 



