xiv THE LYMPH 557 



spleens that did not exist previous to the operation (Vella, 

 Tizzoni). But it was subsequently discovered that there are not 

 seldom nodules of a substance analogous to that of the spleen in 

 its immediate neighbourhood, in the gastro-splenic omentum and 

 great omentum, which represent true accessory or supernumerary 

 spleens, and these after the operation may become more developed 

 (Foa). It has also been demonstrated that if in the act of excising 

 the spleen some of the splenic pulp is scattered in the omentum, 

 it is capable of lodging there and giving rise to the formation of 

 lesser spleens that did not previously exist (Oecchini and Grimni). 

 In no case could the capacity of lymphoid splenic tissue to lodge 

 and reproduce itself be invoked in favour of the theory that 

 the spleen is an organ indispensable to ' life. Whatever the 

 importance of its functions, they may easily be replaced by the 

 other lymphoid tissues which abound in the body. 



Lastly, we must remark that of late years special modifications 

 of the lymphatic glands have been described under the name of 

 haeniolymphatic glands (Leydig, Gibbes, Eobertson, Drummond, 

 Vincent and Harrison, Weidenreich). They are found along the 

 whole length of the aorta, and are differentiated from the ordinary 

 lymph glands by the fact that no lymphatic vessels can be 

 demonstrated in them. Both sinus and the vessels are filled with 

 blood instead of lymph. According to their histological structure, 

 they must represent a connecting link between the ordinary 

 lymphatic glands and the spleen (Vincent and Harrison). In all 

 probability their function is analogous to that of the other 

 haeniopoietic organs (Seemann, 1904). 



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