322 MATHEWS. 



Schifif found that if the sympathetic nerve of the horse be 

 stimulated the parotid secreted quickly 8— lO volumes of white 

 saliva, and then, as in the cat's submaxillary, secretion ceased. 

 If the horse be fed there ensued a copious, clear secretion of 

 watery cerebral saliva. The gland was now, presumably, full 

 of such saliva. If it be allowed to rest for twenty min- 

 utes without secretion on again feeding the horse the first 

 saliva (8-10 volumes) was typical, tliick, ivhitc sympathetic 

 saliva. This was followed by the clear cerebral saliva. Schiff 

 repeated this many times, thus showing that in the interval of rest 

 the gland, uninfluenced by the sympathetic, converts the clear 

 cerebral saliva into typical so-called sympathetic saliva. A sim- 

 ilar phenomenon has been described, with a somewhat different 

 interpretation for the dog's submaxillary, by Heidenhain.* I 

 have repeated Schiff's experiment on the dog's submaxillary, 

 fully confirming him. This is shown in the following exper- 

 iment. 



Experiment XIII. 



Large dog, morphine and ether. At 10:30 a. m. canula in 

 right Wharton's duct. Sympathetic and chorda-lingual cut. 

 On the first stimulation of the chorda the first saliva was viscid, 

 whitish and filled with corpuscles. The chorda was stimu- 

 lated until 2 cc. of saliva were secreted. This saliva was thin, 

 clear, typical chorda saliva. Gland rested without secretion 

 until 11:30. Stimulated chorda. The first saliva was thick, 

 viscid, white saliva. The gland then secreted i cc, clear 

 chorda saliva. Rested until 2:30 P.M. Stimulated the chorda. 

 A very large auunint of typical, syntpatJietic saliva appeared first, 

 followed by 2 cc. of watery chorda saliv^a. Gland rested until 

 4 p. M. Stimulated chorda. The first saliva zuas viscid and 

 contained many salivary corpuscles. Secreted afterward I cc. 

 clear saliva. Rested until 5 p. m. Stimulated the chorda. 

 The first saliva was again viscid, whitish saliva, filled ivith sali- 

 vary corpuscles and lumps. 



* Heidenhain. Studien aus Breslau, IV, 1868, p. 52. "Die erste Speichel por- 

 tion war sehr dick, fast gallertartig, reich an Schleimballen wie sie sonst im Sympa- 

 thicus Speichel vorkommen, und ebenso an vSpeichelkorperchen die haufenweise 

 bei einander lagen." 



