86 ' JOURNAL Oy THE 



Just why smoking should decrease the amount of ammonia in the 

 saliva is not very apparent, but from the above experiments such 

 seems to be the result. The amount of ammonia decreases, too, the 

 longer the time that has elapsed since food was taken. The one 

 experiment under 3° cannot be taken as contradicting this, as it 

 stands alone. 



From the paper above quoted the amounts of ammonia vary greatly 

 with different persons. All of these experiments were made upon 

 the same person. 



Chemical Laboratory, TJ. N. C. 



NOTES ON THE GEOLOGY OF THE REGION 

 ABOUT TAMPA, FLORIDA. 



W. C. KERR. 



The observations embodied in the following notes were made by 

 the writer at such intervals as his broken health permitted, during 

 the spring of 1884. The notes are fragmentary and incomplete, but 

 are now given to the public with the hope that they may contribute 

 something, however little, to a subject that is in need of contribu- 

 tions. A good resume of what is known concerning the more gen- 

 eral subject of the geology of Florida has been given by Smith, in 

 the American Journal of Science for April, 1881 (Vol. XXI, pp. 292 

 et seq.). The writer's observations confined mainly to the region 

 about Tampa, confirm the conclusions of Conrad (Am. Jour, of Sci., 

 II, Vol. II, pp. 30 et seq. and later of Toumey (same journal II, Vol. 

 XI, pp. 390 et seq.), to the effect that the limestone rock underlying 

 the superficial sands of this region, and outcropping along the banks 

 of streams, shore line, &c., is to be classed with the upper eocene. 

 And in the following notes the limestone rock described as underly- 

 ing the superficial deposits, is believed to belong to the eocene in 

 every case. 



On the west side of Hillsboro Bay, at a point 3 miles south of 

 Tampa, and for a distance of half a mile along the shore, there is 

 exposed a partly compact and partly semi-compact rock, rising from 

 6 to 10 feet above tide level and shelving down under the water's sar- 

 faee. This rock is generally a dirty, whitish silicified rock, occasion- 

 ally soft, while at other places it is more compact, hard and 



