7.7 



the other being again stored as lecithin in the tissues above mentioned. 

 The data given, therefore, in the foregoing analyses are of great impor- 

 tance not only from their scientific interest, but also in representing in 

 a general way the distribution of the lecithin in the various tissues of 

 the body. 



DISCUSSION OF THE LECITHIN IN PARTICULAR SAMPLES. 



Lecithin in the meat. In Table 9 it is seen that the mean percentage 

 of lecithin in the residue after extracting the fat from the meats is 0.23. 

 Inasmuch as almost the whole of the lecithin of the meats is found in 

 the muscular tissues, this represents pretty fully the whole amount 

 present in the original sample. The quantity, however, of lecithin in 

 the fat extracted by the ether must not be neglected if we are to con- 

 sider the total amount present in the original .samples. It is noticed 

 that there is a considerable degree of variation in the percentage of 

 lecithin in the different animals, the minimum quantity being found in 

 the ])uroc Jersey, No. 5, and the maximum in the Duroc Jersey, No. 7. 

 It is evident, therefore, that this variation is not to be ascribed to the 

 influence of breed alone. 



Lecithin in the bones. The quantity of lecithin in the bones is con- 

 siderably greater than that found in the meats, the mean being 0.31 per 

 cent. In one instance, namely, the Duroc Jersey, No. 7, the lecithin 

 was determined both in the residual bony matter and in the fat which 

 was extracted. A great difference is noticed in the distribution of the 

 lecithin among the various animals, the maximum quantity being found 

 in the Poland China and the minimum in the Tamworth. 



Lecithin in the marroic. The quantity of marrow was so small that 

 the only possibility of determining the lecithin was in the original ether 

 extract. The data, therefore, are not as reliable as those ascertained 

 by determining the lecithin in the extract after removal of the fat. In 

 each instance the amount of lecithin was very small, except in the case 

 of the Berkshire, where it was quite high. 



Lecithin in the skins. The mean quantity of lecithin in the skin was 

 found to be 0.19; the maximum being 0.41 and the minimum 0.06. In 

 three instances the lecithin was determined in the samples both after 

 extracting with ether and in the ether extract. These cases are appro- 

 priately marked in the analytical tables. 



Lecithin in the spinal cord. Lecithin in the spinal cord was deter- 

 mined only in the materials extracted by ether. As was to be expected, 

 the quantity is very high 5 the mean percentage being 1.54, the maxi- 

 mum 2.95, and the minimum 0.70. On account of the small quantity 

 of the material it was not- possible to determine the lecithin in the 

 residue after the removal of the fat. If this could have been deter- 

 mined it is evident that the quantity of lecithin would have been very 

 materially increased. 



Lecithin in the tendons. In one instance, namely, the Berkshire, the 



