314 GEO. S. HUNTINGTON 



haemophoric systemic lymphatics developed independently by 

 confluence of intercellular mesenchymal spaces. 



In the foregoing analysis it should be kept in mind that the 

 term 'haemophoric lymphatic' is used solely to define the tem- 

 porary embryonal stage in which, in certain embryos, newly 

 developed blood cells which arise in situ in the mesenchymal 

 syncytium and which have never before circulated, are conveyed 

 by lymphatic vessels into the circulating venous stream. The 

 -question of the reversed passage of blood which has once circu- 

 lated from the veins into lymphatic vessels and sacs in open 

 secondary communication with the veins, prior to the develop- 

 ment of the lymphatico-venous valves, is not here considered. 



In the same way the present paper does not touch on the 

 question of the development of erythrocytes from the endothe- 

 lium lining the early lymphatic channels. It is possible that this 

 takes place in late embryonal or even postnatal stages, and some 

 of the structures described as haemolymph nodes may owe their 

 existence to such a prolonged haemopoesis. 



BIBLIOGRAPHY 



(1) McClure, C. F. W., and Silvester, C. F. 1909 A comparative study of 



the lymphatico-venous communication in adult mammals. Anat. Rec, 

 vol. 3, pp. 534-551. 



(2) Silvester, C. F. 1910 On the presence of permanent lymphatico-venous 



communications at the level of the renal veins in adult South American 

 monkeys. Anat. Anz., Erganz. z., Bd. 37, Verh. 2, Internat. Anat. 

 Kongr., Briissel, August 7-11, pp. 76-94. 



<3) Kampmeier, Otto F. 1912 The value of the injection method in the study 

 of lymphatic development. Anat. Rec, vol. 6, pp. 223-232. 



{4) McClure, Charles F. W. 1912 A few remarks relative to Mr. Kamp- 

 meier's paper on "The value of the injection method in the study of 

 lymphatic development." Anat. Rec, vol. 6, pp. 233-246. 



(5) Huntington, Geo. S., and McClure, C. F. W. 1907 The development of 



the main lymph-channels of the cat in their relation to the venous 

 system. Amer. Jour. Anat., vol. 6; Abstr. Anat. Rec, vol. 1, pp. 36-41. 



(6) Marcus, H. 1908 Beitrage zur Kenntnis der Gymnophionen. 2. Ueber 



intersegmentale Lympherzen, nebst Bemerkungen tiber das Lymph- 

 system. Morph. Jahrb., Bd. 38, Heft 4, pp. 590-601. 



(7) McClure, C. F. W. 1910 The extra-intimal theory and the development 



of the mesenteric lymphatics in the domestic cat (Felis domestica). 

 Anat. Anz., Erganz. z. Bd. 37, Verh. 2, internat. Anat. Kongr., Briissel, 

 August 7-11, 1910, pp. 101-110. 



