155 



moved, partly dried by standing in absolute alcohol, filtered and dried in 

 an oven at 105° C. Duplicate Kjeldahl nitrogen determinations were made 

 on each of the respective precipitates. Each of the six duplicates were 

 found to check quite closely, thus indicating that there was nothing gained 

 by the continued solution and precipitation of the mucoid. Incidentally 

 it might be mentioned that there was mucoid lost at each precipitation by 

 incomplete precipitation. This was evident from the fact that by most 

 careful work, starting with 20 grams mucoid, it was only possible to wind 

 up with about 13 grams actual dry mucoid. 



In conclusion, it may be stated that tendon mucoid coagulates, the 

 amount increasing with the duration of boiling, in the presence of neutral 

 salts; that mucoid is not completely precipitated by an excess of dilute 

 acid ; that in a mixture of albumin and mucoid, most of the mucoid and 

 part of the albumin are precipitated by dilute hydrochloric acid in excess. 



As for a remdy, nothing is offered as yet, but this work seems to show 

 that the older methods are inaccurate. 



This work was carried on largely during the last year in the labora- 

 tories of the College of Physicians and Surgeons, Columbia University. 

 New York, where the author was associated with Dr. William J. Gies, and 

 under whose supervision the details were worked out. Owing to the non- 

 possession of the actual notes at present, many valuable data must be left 

 out of this paper, but every statement made can be further demonstrated 

 by experimental data. 



