8 Th. Lewis, 



more particnlary in regard to the origin of phagocytes. He is persuaded 

 that the endothelial lining of the sinuses exists only in places, and 

 that the blood in consequence passes into spaces which are without 

 a definite or continous cellular lining. In his paper on the structure 

 of the spleen, [19 a^] he denies the presence of lymphatic vessels either 

 afferent or efferent, both in the spleen and in the so called "hsemo- 

 lympli glands". 



III. Anatomy and naked eye appearances in Vertebrata. 

 A. Mammalia. 

 1. Primates. 

 In man, haemal glands have been described by several observers. 

 Heneage Gibbs^) found them in the human subject in the neighbour- 

 hood of the renal artery and vein, and published a short account of 

 their general appearance and histology. In 1890 they were further 

 described by Eobertson-), and later by Vincent [J6] in a boy aged 

 nine years as occurring in the mesentery in considerable numbers. 

 A full description, both general and histological is to be found in the 

 recent papers of Warthin already referred to. He finds them in the 

 prevertebral retroperitoneal region and in the neighbourhood of the 

 adrenal and renal vessels, also along the brim of the pelvis, in the 

 root of the mesentery, rarely extending into the latter for any distance. 

 Others are observed in the neck, and a few rarely met with in the 

 omentum and appendices epiploicae. This description, as well as his 

 account of the minute anatomy, corresponds very closely to that of 

 other observers in lower mammals, with the exception of the mention 

 of "marroiuhjmph" glands, the occurrence of which has as yet not 

 been confirmed.'^) He mentions four investigators, Rindfleisch, Weigert, 

 Neumann and Orth, though without reference, as having noticed 

 hyperaemic or hsemorrhagic lymphatic glands. 



Saltykow [13] finds the glands present in 91 ^/f, of cases, in an 

 examination of 60 bodies. 



') Loc. cit. ^) Log. cit. 



•') It is possible that these glands are forms of accessory spleens, for large 

 iniiltiiiuclear cells are frequently found in these organs. 



