1 Fishery Board for Scotland. 



of a dark green, while figs. 80 and 88 were of a lighter, more amber- 

 coloured green. An egg-like body, 1 mm. in diameter, obtained 

 from the fluid, showed a capsule investing a ring of green corpuscles 

 (g.), which surrounded a colourless central sphere (probably fig. 8G). 

 The lobe also contained tubers. The tubers are found attached to 

 or in the walls of vessels (fig. 81). They are opaque amber 

 generally, but when smaller than -25 mm. by "15 mm. they tend to 

 become translucent, and show the cells inside. Under the micro- 

 scope they are yellowish in colour. The tuber is enclosed in a 

 connective tissue skin, which may be readily dissected off. In this 

 skin is a large quantity of yellowish bodies and groups of green 

 little eggs, similar to %., fig. 92, and also of less size. Inside the 

 tuber is much twisted and convoluted. When teamed 1 up the tuber 

 appears to be a mass of green cells. 



The vessels attached to the mass of tubers are infected with little 

 green bodies, which are attached thickly along them. Under the 

 microscope these resolve themselves into two kinds of capsules. See 

 fig. 92, which represents a portion of such a vessel. The two kinds 

 of capsules are yellow, but one is opaque, e.g. x, v, t ; the other 

 translucent, e.g., p, z, y. The latter is the parasite. The vessel 

 and the capsules are covered with connective tissue (ct.). The 

 contents of the opaque capsules consist of little green corpuscles, 

 which have a nucleus and granular contents (fig. 87). In the 

 translucent capsules a nucleus may (ju, fig. 92) or may not be 

 visible (;/., ib.~). The latter capsule (//.) measured *45 mm. in 

 diameter, and appeared to be cellular. It is probably an advanced 

 stage of the translucent capsules. A little capsule (ov., ib.) was 

 colourless. The opaque capsules, to the naked eye, resemble the 

 tuber in colour. They are probably the beginnings of tubers. 



The parasite in an early condition is a translucent capsule, e.g., 

 ov., fig. 92. It absorbs green-coloured material (fig. 86) from the 

 blood probably, and grows larger, becoming greenish-coloured. It 

 derives its food from the blood corpuscles, I think, and the opaque 

 capsules and tubers are, I consider, masses of disorganised blood 

 corpuscles derived from the rupture of the wall of the little blood- 

 vessel. It is possible that the blood corpuscles have also been 

 digested by the parasite. The parasite is probably located in a 

 capillary. 



What was taken to be the gall-bladder was filled with an ink- 

 black fluid. Under the microscoj^e the fluid appeared as fatty 

 drops combined witn a finely-divided black pigment. Johnstone 

 describes melanin in the liver of a skate (Raia clavata) which had 

 a melanotic tumour on the outside of the body. 



The normal liver of the cod is pink in colour. Under the micro- 

 scope the liver fluid shows an enormous quantity of oil globules, 

 with here and there amber-coloured channels. The latter are 

 formed of blood from the crushed tissue. 



Fig. 82 represents a section, approximately natural size, of 

 another hard liver. Only a very little of the normal liver tissue 

 remained at the circumference, viz., at I. The rest is a cheesy solid, 

 reddish-amber in colour, and very oily. In some cases a little 

 strand of normal tissue is cut off in the cheesy mass, e.g., st. The 

 central region (ca.) was filled with soft semi-fluid decayed matter. 

 One nematode at least was observed coiled on the outside of the 

 liver. 



