112 Ciipt. G. E. H. Barrett- Hamilton on the 



may be given off from the liver " (p. 101). It is sIiowm tliat 

 " the accumulation of fat in the musclefi is as great in the male 

 as in the female, and that the fat is used up to quite as great an 

 ea'tent. On the other liaiul, the accuniuhition of tat in the 

 testes is trifling in amount, ami thus the conclusion is indicated 

 that in the male the utilization of fat as a source of energy 

 is much greater than in the female, and this is especially 

 marked in the later months " (p. 104). 



Similarly to the fat, the proteids of the muscles of salmon 

 which have been in the river for some time " undergo a 

 marked diminution, being in part transferred to the growing 

 ovary and testes, and in part use 1 as a source of muscular 

 energy" (p. 112). The muscle of the kelt is very poor in 

 soluble proteid (p. 118). Dr. James C. Dunlop finds that as 

 regards the female fish examined in 1896 " the deficit of 

 muscle proteid in upper-water fish is so large that, after 

 allowing for the requirements of the ovaries, there remains a 

 surplus loss. This surplus loss is available for the liberation 

 of a large amount of energy " (p. 128). 



As regards the male fish a very similar conclusion is 

 formeil, but in this case the " surplus loss is much greater 

 than in female fish, and consequently a much larger amount 

 is available for energy," 



" The changes being exactly comparable to those observed 

 in female salmon, it may be concluded that male salmon, like 

 female salmon, have sufficient proteid stored in their muscles 

 to meet all their requirements in fresh water, and that this 

 proteid is called on to supply the want of the growing testes 

 and for the liberation of energy " (p. 132). 



Some important conclusions are reached by Dr. Paton 

 during his consideration of the fats and proteids stored in the 

 muscles as a source of muscular energy. Thus : — 



"1. Of the fats lost from the muscle of female fish to 

 August oidy a very small moiety — 12 per cent. — goes to the 

 ovaries. The remaining 88 per cent, is available as a source 

 of energy. Taking the metabolism to November, 30 per cent, 

 of the fats go to the ovary and 70 per cent, to energy. 



" 2. Of the proteids lost from the muscle to July and 

 August in the female, 23 per cent, are transferred to the 

 ovaries, 77 per cent, are available for energy ; but later in 

 the season the proteid lost from the muscle is almost entirely 

 transferred to and built up in the growing ovaries, little or 

 none being available for muscular energy. 



"3. It thus follows that while in tiie eailier months the 

 energy of muscular work is derived from the fats to the extent 

 ot 81 per cent., and from proteids to the extent of 19 per 



