1846.] Bones of the Zeuglodon. 231 



to pass into the molars by gradation, becoming flattened, and with 

 the fags still united, though deeply groved. This change goes 

 on till the perfect molar is formed, when these also vary greatly 

 in their crowns, &.C. 



The tympanic bones were found imbedded in the matrix in 

 which some of the others were covered which resemble the Ceta- 

 cean, only they are much smaller than those of the sperm whale. 

 They are only three inches long, and one and a half to two inches 

 thick. 



[To be continued.] 



DROWNING. 



The cause of death by drowning, is the exclusion of air from 

 the lungs, and not the inhalation of water, as some suppose. If 

 persons then who may happen to be thrown into the water, will 

 preserve presence of mind they may be often rescued from this 

 perilous position, though they are unable to swim. We may put 

 confidence in this assertion, because the body, when the lungs are 

 only partially inflated with air, is specifically lighter than water. 

 A person then, who would avail himself of this fact, must suffer 

 his whole body with his arms to be immersed; and, at the same 

 time, throw his head back, so as to bring his nose and mouth up- 

 wards. In this position he may float for a long time provided he 

 does not struggle, and thereby exhaust his strength unnecessarily. 

 If he but raises one arm above the water his face will sink be- 

 neath the surface of the water, hence the proper w^ay is to remain 

 perfectly calm, and let the body float in the position designated. 

 It is, however, important, when a person is conscious that he is 

 about to be submerged, to take two or three as deep inspirations 

 as possible, after having first expelled all the air possible in his 

 lungs; as thereby a new and larger stock of respirable matter is 

 secured, by which respiration may be suspended with safety a 

 longer period than it could be without this precaution. 



