270 QUARTERLY CHRONICLE. 



In this case it "was indeterminable whether the deposit had 

 being formed during life, or whether it was the product of 

 incipient putrefaction before the smoking. But this seemed 

 to be unlikely, as the ham appeared qviite fresh, and tasted 

 and smelt quite sweet. The author is convinced that similar 

 deposits of tyrosin v/ill often be met with, and it seems 

 useful to bear the likelihood of such an occurrence in mind 

 when the microscope may be called upon to determine the 

 nature of doubtful appearances in ham or pork. 



Max Schultze's Archiv. — Part III has not yet been received 

 in this country. 



Bibliotheque TJniverselle. June. — " On the Contractile Tissue 

 of Sponges," by N. Lieberkiihn. — In a recent supplement to 

 his numerous investigations of Sponges, Lieberkiihn has paid 

 special attention to the ciliated embryos of the Spongillge. 

 The ova present a perfectly regular segmentation. They are 

 situated, like the embryos, in lacunae of the parenchyma of 

 the body. It is there also that the spermatic cells are found. 

 To observe the embryos, Lieberkiihn divides the Spongilla 

 into thin sections, which he leaves to soak in water for a day. 

 The embryos, up to the moment when they commence their 

 independent life, remain in the envelope formed by the con- 

 tractile tissue of the sponge, in which they turn about by 

 means of their ciliary coat. During this jjeriod the cavity of 

 the body, which is filled with liquid, is formed. A portion 

 of the spheres of segmentation which have not undergone 

 much modification are crowded together in the posterior part 

 of the body, where they form an opaque mass. The cilia of 

 the embryo are very long, and implanted upon still amorphous 

 sarcode, and not upon true cells. The mass of the embryo 

 properly so called, however, is formed by contractile and 

 nucleated cells, a portion of which enclose siliceous spicules 

 in their interior. This tissue is identical with the contractile 

 parenchyma of the sponge itself. 



July. — " On Inflammation and Suppuration,''^ by J. Cohn- 

 heim. — The labours of Herr Virchow on connective tissue 

 have inaugurated a new era in histology, in which all authors 

 are agreed in attributing to the stellate corpuscles of this 

 tissue an extreme importance.* Perhaps this importance 

 may have been exaggerated ; at any rate, a reaction against 

 the ideas of the school of M. Virchow is beginning to make 

 itself felt. The corpuscles of the pus, on the origin of which 

 anatomists have so much disserted, are considered generally 

 at present, with Herr VirchoAv, as resulting from the ab- 



* See Translation of Franz Boll's paper on the Lachrymal Glands in this 

 uiniber of the Journal. 



