122 Journal of Comparative Neurology. 



IX, Explanation of the Entries in Table VII. 



From this table all derived numbers such as ratios and per- 

 centages have been purposely excluded. The derived numbers 

 appearing in the body of the paper are, however, based on the 

 records in this table, and can be verified by means of them. 

 As will be seen by examining the table, the various weighings 

 were in centigrams or milligrams, as the case demanded, and 

 lengths were taken in millimeters or tenths of a millimeter. 



To facilitate the understanding of the Table, an explana- 

 tion of each of the entries there found, is added. 



Number. — The number is given solely for the purpose of 

 identifying the record. 



Sex. — M. Male. F. Female. 



Body-weight. — The total weight of the body as taken im- 

 mediately after death, was corrected, if necessary, first by sub- 

 tracting the weight of the stomach contents, when this was ap- 

 preciable, and second, in females, by subtracting the weight of 

 the ovaries, when these were mature enough to show black pig- 

 ment. A correction for the loss of weight in spring frogs was 

 also made. 



Length. {Lgth.) — The frog was hung by a hook through 

 the under jaw and raised until the tip of the longer foot 

 just touched the table. The length was then taken in mil- 

 Hmeters from the level of the highest point of the upper jaw to 

 the table. The two legs of a frog often differ slightly in length. 



Weight of the muscles. — Thigh — shank — toot. The leg 

 was separated from the trunk by cutting first along the faint 

 line which marks off the skin of the thigh from that of the 

 trunk. The proximal attachments of all the thigh muscles were 

 then cut with a scissors and the femur disarticulated at the hip- 

 joint. 



Similarly, a separation was made at the knee-joint and at 

 the ankle. 



Each segment thus consisted of the bone or bones belong- 

 ing to it, surrounded by the muscles and associated tissues, and 

 covered by the skin. 



