CORRECTIONS. 

 P. 20, line 14— For 2S^\07\1 read '2SS\07\1. 

 P. 39, line 3 from bottom — For will read will. 

 p. 43, line 7-ror r (r + 1) (^ + 2) . + 3 ^^ 



r (r + 1) (^ + 2) (r + 3) 

 1. 2. 3. 4 



P. 49, line 2-For ^^ <" + ^^ ("+/>(" + ^^ read 



71 U + 1) U + 2) {n + 3) 

 1. 2. 3. 4 



P. 225, line 10 — For napsida read Synapsida. 



P. 290, line 5 from bottom — ^For first read second. 



P. 310, line 4 — For seem read seeTns. 



P. 318, line 3 — For by physiological conditions of the indi- 

 viduals read by the physiological condition 

 of the individual. 



