100 EXTRACTS FROM FOREIGN PERIODICALS. 



The length of the male is from eight to ten lines. That of the female, on the 

 contrary, is five — or, according to Cuvier, even six — inches. I have further 

 observed that specimens taken from Wolves are invariably larger than those ob- 

 tained from Dogs. 



As regards the parts in which the Worm lodges, it has been met with in the 

 frontal sinuses of Dogs, Wolves, Horses, and Mules. The specimens which I 

 shall describe were also obtained from the frontal sinuses as well as from the 

 ethmoidal cells of the Wolf and Dog ; I have found them in considerable num- 

 bers in both these parts, and even in the month of March in the first, while I 

 have seen them in the latter only in June. I have collected from a Wolf three 

 females and four males, and from a Dog four of each sex, a circumstance the 

 more surprising as it is known that the males of most intestinal Worms are very 

 rare. Diligently as I have sought this animal in Horses, I have never yet suc- 

 ceeded in finding it. — Annales des Sciences Naturelles, troisieme Annee. 



2. On the Mucous Body, or colouring Tissue of the Skin, in the 

 Charruan Indian, the Negro, and the Mulatto. — M. Flourens (Acad, 

 des Sciences, Dec. 12, 1836) has profited by the death of two of the Charruan 

 Indians brought to Paris in 1832, to study their organization, and the special 

 6bject of his paper is the structure of the mucous tissue of the skin. 



After tracing the history and actual state of science on this delicate anatomi- 

 cal point, M. Flourens announces that he has discovered, between [the flower 

 skin and the epidermis four distinct layers ; the first placed on the proper skin, 

 the second containing the colouring matter, and the fourth layer or third mem- 

 brane placed between the cuticle and the pigmentum, or coloured tissue. 



The first of these membranes, continues M. Flourens, that situated under 

 the dermis, is cellular, and disposed in coats or in net-work. 



The second, of the nature or at least of the consistency of ordinary mucous 

 membranes, is continuous. Its external surface bears the colouring matter. The 

 internal surface is studded with prolongations traversing the holes of the cellular 

 membrane, and attached to the dermis. 



These prolongations are very remarkable. They form the sheath of the hairs, 

 pass under their roots, appear to constitute the internal plate of their bulb, and 

 ■only exist where there are hairs. 



It should not be forgotten that, at a certain degree of maceration, the pigmen- 

 tum detaches itself from the membrane of which I have been speaking, and re- 

 mains attached to the following, which I am about to describe. 



The pigmental membrane itself is nearly of equal consistency throughout, and 

 sufficiently thick to be divided into two leaflets, one of which may be the plates 

 of Cruikshank ; for Cruikshank has not characterised his plates, a circum- 

 stance which renders his fine work incomplete. 



