OBSERVATIONS. 



logists, the longitudinal fissure is taken as the line of 

 separation of the right from the left side. The left 

 human lobe, however, really consists of the original left 

 lateral lobe, together with the left mesial lobe, the original 

 left lateral fissure having disappeared. The ideal divi- 

 sion would be one applicable to all the mammalia, and 

 Flower's arrangement is not even applicable to all mem- 

 bers of such closely-allied orders as Monotremes and Mar- 

 supials. It could not apply to the Monotremes, Kangaroo, 

 Tasmanian Devil, and some varieties of Wombat, nor 

 would it hold for the liver of the Gorilla, in which the 

 mesial or cystic fissure (human, longitudinal) is dimi- 

 nutive compared with the left lateral fissure. The divi- 

 sion is best dominated bv the arrangement of the vascular 

 and biliary systems. In a minute examination of livers 

 belonging to Monotremes and Marsupials, I found that 

 they conformed to a single plan, viz., right and left por- 

 tions, with the portal vein, gall bladder, cystic and com- 

 mon duets, as the common stem. On the right side 

 of the stem, cystic and venous branches were trace- 

 able to the right lateral and right mesial lobes, and 

 on the left side to the left lateral and intermediate mesial 

 and left mesial lobes. The true line for the division of 

 the liver into right and left portions would be from the 

 fundus of the gall bladder through the portal fissure to 

 the dorsal border, as originally defined bv James Oantlie. 

 Apart from comparative anatomy, this division is sup- 

 ported by pathological findings. We can inject sepa- 

 rately into one or other side of the human liver. New- 

 lands, the distinguished Adelaide surgeon, has told me 

 that he has seen hydatid involvement of the right side 

 of the liver, with compensating enlargement of the left, 

 and Oantlie observed this in connection with atrophy of 

 the right side following chronic abscess, in which the liver 

 was almost of normal weight. This conception of the 

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