FIBROUS TISSUE PRODUCED AS A REACTION 'I'O INJURY. 595 



The Origin and Formation of Fibrous Tissue 

 Produced as a Reaction to Injury in Pec ten 

 Maximus, as a type of the Lamellibranchiata. 



By 



a. H. Orew, B.A., 



Beit Memorial Research Fellow ; and 



\¥. De Moig^aii, F.Z.S. 



With Plate 24. 



Contents. 



PAGE 



Introduction ...... 595 



Methods . . . . . .596 



Description of the Tissnes of Pec ten maximus involved in the 



Experiments, and the Normal Process of the " Clotting " of 



the Blood . . . . . .598 



The Formation of Fibrous Tissue at the site of the Implantation 



of a Mass of Gill-Tissue .... 600 



The Formation of Fibrous Tissue at the site of the Implantation 



of Digestive Gland Cells .... 604 



The Reaction of the Tissiies to the Implantation of a Mass of 



Sterile Agar Jelly . . . . . 606 



Summary of Results ..... 608 



Reference* ...... 609 



Introduction. 



The experiments described in this paper were performed 

 on Pecten maximus at the Laboratory of the Marine 

 Biological Association at Plymouth. 



The object of our work was to investigate the histology of 

 the reaction of the tissues to the presence of a foreign body, 

 and to determine the origin and method of formation of the 

 fibrous tissue formed around it. 



