Dr. Waller on some Tissues in the Animal Frame. 27 1 



carbonated alkalies, carbonic acid being disengaged on boil- 

 ing, but it is insoluble in lime and baryta water. The solu- 

 tion in ammonia gives with chloride of calcium and chloride 

 of barium fiocculent precipitates, consisting of roccellate of 

 lime and baryta. A solution of roccellic acid in alcohol is pre- 

 cipitated by an alcoholic solution of acetate of lead, but not by 

 a solution of nitrate of silver. A solution of it in ammonia 

 gives with nitrate of silver a white gelatinous precipitate, 

 which becomes brown when the fluid is boiled, but is not 

 completely reduced. An alcoholic solution of roccellic acid 

 does not reduce chloride of gold on boiling. 



On being ignited with oxide of copper — 

 I. 0*42100 grm. gave 1*0200 carbonic acid and 0*4025 water. 

 II. 0*2815 grm. gave 0-6795 carbonic acid and 0*2720 water. 



From these numbers the following composition may be 

 deduced : — 



The lead salt was prepared by dissolving the acid in a small 

 quantity of ammonia and precipitating with acetate of lead. 

 I. 0*4475 grm. gave 0*5530 carbonic acid and 0*2070 water. 



0*3405 grm. gave 0*0705 lead and 0*0990 oxide of lead. 

 II. 0*4360 grm. gave 0*5490 carbonic acid and 0*2025 water. 

 0*2860 grm. gave 0*0/30 lead and 0*0675 oxide of lead. 

 These numbers correspond to the following composition : — 



5364 100*00 100*00 100*00 

 This salt is therefore basic. I have been prevented by want 

 of material from examining the other salts of the acid. 



XLIV. Microscopic Examination of some of the principal 

 Tissues of the Animal Frame, as observed in the Tongue of 

 the living Frog> Toad, fyc. By Augustus Waller, M.D.* 

 [With a Plate.] 



r |^HE peculiar structure and disposition of the tongue of the 



*■ frog affords great facilities for its examination under the 



* Communicated by the Author, 



